Atlus, in a "not so secret" press release, has announced their full lineup for E3 2010. While one of the games we already knew about thanks to a Nintendo Power reveal, the other three have yet to be announced until now.
The four games are Etrian Odyssey III: The Drowned City (Nintendo DS), Knights in the Nightmare (Sony PSP), Trine 2 and Rock of Ages.
Rock of Ages is the next game from ACE Team, who were responsible for Zeno Clash: Ultimate Edition. Trine 2 is the "mystery" title that Atlus was previously talking about. Both games have yet to have their platform(s) revealed.
Knights in the Nightmare on the PSP is a port of the original Nintendo DS version with modified controls and new story and gameplay features, similar to the PSP ports of Riviera: The Promised Land and Yggdra Union. Etrian Odyssey III is the third game in the series, which was first revealed in the newest issue of Nintendo Power.