Killzone is the best PS3 exclusive shooter imo.
I can wait till the next one though, however if it is ever going to come out at Christmas it has to be this year because;
1) It will counter Halo Reach
2) Because COD will most likely come out from Treyarch instead of IW this year. (less competition)
If it comes out next year it will probably have to counter Modern Warfare 3, and that..... would not be smart.
I think KZ3 should be given all the hype possible by Sony, but just consider how many games Sony has coming throughout 2010 and presumably over the holidays. A rational preson can project that Sony will have to put a lot of effort into time management of their exclusive releases. They also have to decide which games they are going to market the hell out of going forward. I expect this packed release schedule to continue well into 2011 for Sony.
Expect mega advertising/promotions for;
GOWIII
Gran Turismo
a flury of JRPG's in Japan
and others
I would be surprised if KZ3 ever gets a holiday release window, it may release 2 years after KZ2 to the day.
It is amazing that Uncharted 2 was given such an unrivaled window, that was very well done by Sony.
I'm rambling.... Yes I will buy KZ3 no matter what.