I can't say I'm particularly shocked at this point. 2009 was a year of change for this guy, and that was obvious for some time. Though I think it's kind of funny how the officialtiesto Youtube channel constantly tags its videos with "trance."
Full article: http://www.tiestoworld.nl/TheBigIssue2009
"You don't hear trance records in my set at all now."
I think the case is pretty much closed. Tiesto is all but done with trance music now and isn't planning on looking back anytime soon. Of course, someone who is a thinking person with creative ambitions can't force themselves to stick with something forever if it isn't working out. So this is Tiesto's way of saying that he's releasing himself from his long lived association to trance music. He's focused elsewhere.