Fantastic series, its true
The first one was great
The second one is the best one, a classic
The third one was great also and long and rapped the trilogy beautifully (new engine, all 3d)
The forth one is the longest one, and the most underrated one, cause i found it to be the most enjoyable one (gameplay wise), and the longest one (40 hours), but it was a commercial flop too bad.
Keji inafume, the creator of the series, is busy these days running capcom so i dont think that there will be another one soon, but i hope that they make a HD remake for the second one.

Currently Playing: Final Fantasy XIII (PS3), White Knight Chronicles (PS3), PES 2010 (PS3), Killzone 2 (PS3)
Games to Finish: Silent hill Homecoming (PS3), Valkyria Chronicles (PS3), Oblivion (PS3)