If the existence of the Sony PSPgo was the video game industry's worst kept secret of 2009, then the 2010 version involves PlayStation 2 games becoming available for purchase via the PlayStation Store for play on the PlayStation 3.  IGN has an interview with Sony's Peter Dille in which he mentions the future of PS2 games for sale on PSN as "found money".  Kotaku has the relevant quote.

"From our side, we're going through our own studio organization and trying to make sure all these old games are out there so that we can lead by example, but we're also communicating with all the third-parties about the success of the Final Fantasy games, and other PS1 and PS2 classics," Dille tells IGN. "By all means, I think people can look for more of that because once the third-parties see how this works, it's just found money. There's not a whole lot of work that has to go into it and once we can get it up on the network, it finds an audience pretty quickly."

My educated guess is that we'll hear something more official at E3 this year.  Here's hoping that when the PS2 games come, they're reasonably priced and look fantastic on modern hardware.  Why not start with rare games that are expensive on the used game market instead of something that sold ten million copies and can be had now at any GameStop for $7?  If we're going to do this, then the result has to have added value over getting out my old PS2 for a little do-it-yourself backward compatibility.

Hey, wait... if the PS3 will soon play PS2 games without needing specialized PS2 hardware inside the case, then why couldn't it just read the PS2 discs that I already own?  I'd prefer a convincing answer that does not involve the words "profit" or "revenue".