The annual Game Developers Conference is already underway this week, and Sony came out the first day announcing a number of titles for all of its platforms, including the PS4. Interestingly enough, all the of the titles announced for its platforms are indie titles created by small studios. It speaks volumes to Sony's renewed commitment to indie titles that it touched upon at its PS4 reveal event in February.
Indie games may not be what some gamers were expecting from Sony, but the focus on these small titles is a major boost to Sony's reputation at an increasingly indie-focused event like GDC. It doesn't hurt that the majority of the titles shown at GDC also show an incredible amount of promise.
For the PlayStation 4, Sony only announced two indie games for the platform - Blacklight: Retribution and Primal Carnage: Genesis. The former is a free-to-play shooter supported by microtransactions. Sony is already experimenting with free-to-play on the PS3 with games like Dust 514 so it will be interesting to see what the platform holder does with FTP games on the PS4.
As for Primal Carnage: Genesis, the game is an episodic first-person shooter title that could very well be seen as the spiritual successor to Dino Crisis.
As for other platforms, a number of games are being developed for both the PS3 and PS Vita.
Last but not least, Sony announced a number of titles for its fledgling PlayStation Mobile platform. These games are intended for mobile devices, like those from HTC and Sony, but the games can also be played on the Vita as well.
If you were expecting major announcements out of Sony, you will probably have to wait until E3 when the company is expected to reveal more about the PS4 and the AAA games coming to the platform. For now, start setting aside a bit of money to purchase Thomas Was Alone for when it launches on the Vita.