Haha, great humor buddy!
Portal 2 just came out about 4 years after portal 1 so im gonna guess 2013. Don't bring your hopes up, VALVe has got
DoTA2 (in progress)
CS2 (We don't know)
TF3 (We don't know)
-third surprise hasn't even been announced yet- (the 3 suprises were dota 2, portal 2 and the 3rd hasnt been announced)