Well... Free Radical, the team that brought you Goldeneye and Perfect Dark (formerly with Rare and Nintendo), and the Time Splitters trilogy just got bought out by Crytek UK (the makers of Far Cry and Crysis). Crytek said the only way they will make TS4 is through public demand; so what are you waiting for?! Sign the petition:

http://www.PetitionOnline.com/TS4tcbd1/petition.html

Never even played any of the Time Splitters games. So I don't think I will!