not any "news" that I know of besides that they are working on a new STALKER and after months of speculation regarding which engine they will use (the cryengine2/3 came up a few times) they still have not disclosed that information yet. So I would say no, no info. I'm not looking forward to the ending of COP because that would mean that the game is over. Atm I don't want the game to stop. Just give me sidemissions of that quality and I'm happy.
If they do (and I'm certain they will) a next part I sure hope they come up with a story on par with SOC with better story telling like they are doing in COP and maybe a little more RPG stuff in how to tackle a mission and - dare I say it - better stealth, yes, please.