Brief Info:
Speculation over this website has spread like a virus, biggest guess is a teaser for a Valve Movie.
http://www.whatsinthebox.nl/
Video:
http://www.youtube.com/watch?v=IU_reTt7Hj4
I don't believe this, but I'm looking into it. I'll update this thread with whatever information I find for it.
Discovery #1: Source Code Message
A quick look at the source of the code reveals a two line message.
I'll look into it some more. Maybe it's a quote from somewhere.
[size="6"]Discovery #2: Credits Coding[/size]
When you place you mouse over the box, it flashes red and question marks appear over some letters in the credits, like so.

After a look, I have formed the letters in order they appear. The question marks seemed to only cover half of the letters sometimes, I've marked these in parenthesis. Here is what I got
OTION NT(S) ST(E) WHATS IN THE BOX
RS TI(M) CREA TEV (R)O (E)CTOR PHY BAUT MSMI
S TH IMS(M) EEU(W) S(M) DITO(R) MS(M) C(E) E(C) (M)IT (U)T
DDITIO(N) R EREL U(R) OOS(T) D A(R)
Here is a closeup of the original and "marked" credits for anyone who wants to check them out.


[size="6"]Discovery #3: CSS Pages[/size]
In the websites source code it refers to these 2 CSS pages. I know diddly about CSS but some guy at FP produced something which seems to have some kind of CSS coding, each one different from the other.
[size="6"]Discovery #4: Four Digits[/size]
The randomizing four digit "code" between the credits and the glowing box is some kind of Javascript application. Unless I'm reading the source code wrong it seems to consist of one line.
[size="6"]Discovery #5: Black Mesa Reference[/size]
During the video, in the scrolling text at the bottom a reference to Black Mesa can be seen.

It reads: "A largest single collapse in history since Black Mesa"
This implies Black Mesa has already happened and anyone familiar with the Half-Life time line will know if this disproves a Half-Life movie. When Black Mesa collapsed basically the entire world collapse since the combine and other aliens moved quick. This line makes it sound like Black Mesa 'collapsed' and things got better after thaT. However, the 'Blackhole' seen in the movie could be the citadel falling apart and they scrolling text at the bottom could be some kind of combine news scroller addressing about Black Mesa but why would they do that? Hmmm...
[size="6"]Discovery #6: The "Anti-Box"[/size]
An image that is like the homepage of the site but mostly white and lightly colored can be found within the source code. Link to the image since the image is too big: http://www.whatsinthebox.nl/anti.gif
Here is a side-by-side comparison of the two boxes. (Not the 'evil' box has some sort of letters in it?)

There seems to be writing in the background I tried reading it and typed it up to the best of my ability. Maybe someone can crack open photoshop and see what they can get. Here is the message, a -?- means its obstructed by the cube and brackets mean its highlighted.
Evergy-conversion efficency
coated with a monolayer of a charge transfer
and the ideal spectral characteristics of the dye, the
high efficiencies for the conversion of incident
is [71-73.5%] in simulat-?-ht and [87%] in diffuse daylight
(sustaining at lieast fiv-?-without decomposition
photovoltaic d-?-is prohibitively expensive
more than-?-a photovoltaic
which exh-?-on efficiency
partic-?-olayer of a charger
surface area o-?-characteristics of the
(46%) a-?-he conversion
energ-?-lar light and 12%
exceptiona-?-novers without
THE large-sca-?-city generate
costs ab-?-ods1. Here we
through low-cost pro-?-ealistic energy
film of titanium diox-?-n size, coated with
of the high su-?-ductor film and the ideal
solar energy-?-hows exceptionally high
the overall light-to-?-nergy conversion yield
than 12 mAcm-2-?-and exceptional stability
Apparently the cube has something to do with creating energy...energy that can triumph solar power and provide this energy with a high stability.
Discovery #7: Randomizing 4 Digit Code[/code]
Looking at the code that creates the randomizing 4 digit code, we find out that it isnt so random.
bullshitArray.push("0001");
bullshitArray.push("WSAD");
bullshitArray.push("134G");
bullshitArray.push("ASDF");
bullshitArray.push("123A");
bullshitArray.push("1234");
bullshitArray.push("5223");
bullshitArray.push("QWER");
bullshitArray.push("FASG");
bullshitArray.push("4213");
bullshitArray.push("UUUU");
bullshitArray.push("READ");
bullshitArray.push("FAST");
bullshitArray.push("JFSD");
bullshitArray.push("2123");
bullshitArray.push("BOXR");
bullshitArray.push("SAGA");
bullshitArray.push("JFSD");
bullshitArray.push("2123");
bullshitArray.push("6335");
bullshitArray.push("2347");
bullshitArray.push("2678");
bullshitArray.push("7856");
bullshitArray.push("1111");All these codes come up, so the numbers aren't random.
[size]Discovery #8: Interview With The Director[/size]
A video of an interview with two guys part of this project have apparently given an interview on a foreign TV show, I'm not sure what language they're speaking but if someone can find out and translate that'd be great.
Video:
http://www.youtube.com/watch?v=E8rRb4z0gVA
I'll look into it when I can, if I'm wrong on anything or you found something new tell me and I'll fix/update it.
Also, sure this may just be some big ol' prank like Eon8 (Anyone remember that shit? Haha) but who cares? This investigation is all in good fun.
Thanks to:
Broseph, for noticing the code when touching the box
Beta, for the anti-box image
Steyene, for the 4 digit codes
Scorpioxxx, for lots of code from the website