Don't get your hopes up too high yet. This is just a video of what is supposedly an iPhone version of Valve's critically-lauded game, Portal. Just like the Resident Evil 4 game we saw a few days ago the authenticity of the video has already been brought into question. The RE4 game ultimately ended up to be real. This one's still up in the air, but real or not, it certainly looks pretty damn good.
The game was supposedly made using the Unity engine, a multi-platform development tool that has also been used in iPhone games such as Zombieville U.S.A. OS X Reality points out that Valve has made no announcements or anything that point to an official iPhone port of Portal, so this could be just another awesome fan project. Then again, like the video itself asks, is this cake a lie? I bet a lot of Portal fans hope it isn't.