Yup, that's the name of the game. The game's also called "Sound Edition" (probably because 3nd Impact is impossible to pronounce), but 3nd Impact is the working title. Go figure.
Anyway, it's a rhythm action game for the PSP being developed by Grasshopper Manufacture (No More Heroes, Shadows of the Damned) and Namco Bandai (their first co-operative effort since the slightly similar Samurai Champloo: Sidetracked). Not too many exact details on the gameplay, but if you watch the trailer after the jump, you can see all of the games that will be in 3nd Impact. They're all rhythm-based, some with scenes from the films, some with in-game rendered Evas and Angels, and some with stationary character portraits.
Hit the jump for the trailer and some information on the various editions of the game.
http://www.youtube.com/v/P_G57bGI-BI?version=3&hl=en_US
There's a soundtrack edition (pictured above) and a limited edition in addition to the standalone game release. The soundtrack edition (priced at ~$104, says Siliconera, though Amiami.jp lists it at ~$86) comes with the game and the soundtrack, both in a classy red sleeve, similar to the Evangelion 2.0 DVD/Blu-Ray packaging. The limited edition (priced at $143 according to Siliconera) comes with everything the soundtrack edition does, in addition to an Evangelion 2.0 shirt and special Audio-Technica earbuds.
Haven't found a place to pre-order the full limited edition yet, but Amiami.jp has the soundtrack edition here. According to their listing, the game's set to release this fall.
Now, if you'll excuse me, I'm going to watch Evangelion 2.0: You Can (Not) Advance for the dozenth time.