After hearing a rumor that WCG only planned to announce 2 more Xbox titles and 1 more PC title, I followed up to figure out the source of the information. Turns out the source is fairly credible as it has been listed on the US WCG site. Specifically, the amount being 8 games is mentioned in the FAQ here and the game breakdown is pictured here.

Of course, this is still not 100% official, but would appear to be the final game count and system breakdown for this years WCG. The development should not be unexpected due to the whole global economic downturn, and I am happy to see that any games are being added myself.