https://www.youtube.com/watch?v=GJt2ZnL9eTQ ^ Persona 4 DVD Trailer (Japanese) it's pretty long too, enjoy yourself. It's a DVD included in the Weekly Famitsu (Issue 1007).
Don't break your hope first, PERSONA 4 is coming out for PS2. YEAH~! (If they come out for PSP, I will bounce and kiss random people Wildly)
The style for P4 will be a little bit old style and based on Japanese style(Err, retro), the soundtrack, like oh meow~ still the same too. The story will be different with the P3. O_O The characters also not P3's, so be ready to meet new people. (I Like Hanamura-san. *melts*
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http://en.wikipedia.org/wiki/Persona_4^ More infos in here, D= don't expect me to do speech in the morning.
The release date will be July 2008 in Japan(Japanese version). The English version release still unknown, but I think around November-December 2008, or maybe New Year 2009?
Will post more updates if I found one, if you guys and girls got updates, feel free to post it in here too.
*winks winks* Yuki gonna drools for this. xD