PS4 may not be available until November 15th, but that doesn't mean you can't start buying games now. PlayStation Store has started selling pre-orders of upcoming PS4 games, including one free-to-play game you can "buy" right now. Look at you, buying a PS4 game already!

The collection currently includes two games: Knack ($59.99) and Warframe, a free-to-play shooter from Digital Extremes. You're less likely to know about that game, so here's a trailer:

As ATimson points out, these games should work towards Sony's current PlayStation Network promo, which has you earning $10 rebates for every $50 spent.