Konami just announced during their stage presentation at Tokyo Game show,  the development of the new chapter of the Suikoden series.

The game is titled Genso Suikoden: Tsumugareshi Hyakunen no Toki, and it will be, surprisingly, still on the PSP (well, it's not that surprising considering how massively popular the PSP is in Japan). It already has an official website and a twitter account, even if the release date is still unannounced.

The teaser trailer shows no gameplay, but only some of the anime-style cutscenes. You can see it past the cut:

http://www.youtube.com/embed/ySAlckdIaic