Scans from the April 2010 issue of Gameinformer have confirmed that Portal 2, the sequel to Valve's wildly popular and critically acclaimed game Portal, will be released in fall of 2010 for the Xbox 360, PC, and Mac (as reported on MacRumors). No, your eyes do not deceive you: Portal 2 is coming to the Mac this fall.
More on the Valve front: TUAW reader Jason let us know that Gameinformer's April 2010 issue also confirms a May launch of Steam for the Mac. This was rumored several weeks ago based on some WebKit & Mac-specific content in the Steam beta, and pretty well locked in by Valve's viral leaks of Mac-themed 'reimagined' advertisements last week. (The final one is a bit of a give-away... read the copy.)
"There is an article on page 22, News, 'Mac Gets Its Steam On' - Valve preps May launch on Apple platform," Jason tells us. He also says the article itself states, "Valve will start a beta program this spring, with a full launch targeted for May [...] If you already have a Steam account but want to use it on your brand-new Macbook, for instance, your Steam keys will still work."
That last part is pretty huge; from the sounds of it, if you already bought PC versions of games on Steam, you won't have to pay again to download Mac versions of the same games. That should be a huge relief to Mac gamers who've been booting into Windows to get some gaming done.
We haven't been able to confirm this reader tip, so if any of you have access to the same issue of Gameinformer and can confirm what Jason's told us, let us know in the comments.