New games

I cannot give you exact release dates but on this link they have the month of the release date. (Even if you did have release dates that were exact it would probably be inaccurate because even the Ngage website has'nt got exact dates.)

http://www.n-gage.com/en-R1/games/

Most, if not all, games in existence + planned are listed on http://www.n-gage.com. There are very seldom exact release dates given for software or hardware products (there are, of course, exceptions to this, but still...).