I had a lot of good times and even more bad times with DotA over the years, until I finally freed myself from it years ago.
IceFrog being behind this backed by Valve bodes well, and I think the premise of an FPS/MOBA hybrid has promise, despite the market being insanely oversaturated already.
I'm not really interested in competitive games these days, but I hope it'll be good to watch at least. Following The International was fun even after I quit DotA.