
Well, Tower Defense has been ported over. But DotA is a completely different animal. Not only do 92 heroes have to be translated, but all the animations, and spell animations. Also, would the AI or regular one be ported? If AI, you have to build the AI for all the heroes, on all three difficulty settings.
Basically, I would answer "No, it's never going to happen", but I'm not going to say it's impossible.


