This is pretty easy from a business perspective from Sony.
Killzone 2 has sold 2.26mill
resistance 2 has sold 1.86 mill
Kz2 is developed by a first party, R2 by an independent studio.
Therefore, according to pachter, sony make 48$ on each kz2 copy sold, but resistance 2 sony only makes about 38$ per disc.
So it would make better business sense to put kz3 on the market in winter







