This year, Warner will unveil two brand new titles, where one is said to be a major title... (hmm think think...) as well as offering hands-on on upcoming titles:

Batman Arkham City: Armoured Edition
Injustice: Gods Among Us
LEGO: Lord of the Rings
Lord of the Rings Online
Guardians of Middle-Earth

However I'm sure that we can expect to see more from Warner during GamesCom, even some of the old timers.

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Source:	Warner Games
Related:	GamesCom: Nexon EU lineup
	GamesCom: Ubisoft lineup