The free to try "feature" is getting a lot of press. So are these supposed to be the full versions of games that are only playable for a limited amount of time? Or are they just demos? If they are just demos then it seems pretty ridiculous to advertise this as a feature. The Xbox 360 has demos for nearly all its games too.
It's up to the developer what in the game is free. It can range from a demo, a timed trial or micro transactions. Their point is simply that some portion of gameplay will be free for all games. What a player has to pay for will be up to the developer.
Personally, I'm particularly interested in seeing free to play MMOs on this, since that's something the current consoles lock out developers on (with a few exceptions, like DC universe online). Nexon makes some great games that I would love to play with a controller for once on my TV (Like Dungeon Fighter Online)
N. Allen. Dungeon Fighter is awesome. You can use a controller on the game using an external mapping program on PC. I use JoyToKey and it works flawlessly after you get it set up. http://www.electracode.com/4/joy2key/JoyToKey%20English%20Version.htm