Sylar Stole My Brain and Heroes Season 3

It has come to my attention that there is a 'Sylar Stole My Brain' t-shirt in existance. This is it below for those interested:
Just remember it is mine though.
I've also just finished Series 3 of Heroes and it was a really sad ending. I won't spoil it for peoples who haven't seen it yet. It was really crazy stuff though! Best series so far. It's made me think about which out of LOST and Heroes I prefer.
As usual, I've been trying to find airing dates for season 4. No luck so far! Any help would be nice.