While you must admittedly use Warcraft 3 to play DotA, I don't feel that there is any actual connection to DotA and Warcraft branding. They do not own the rights to DotA as it stands now. It's arguable whether they should or not at this point. I think they shot themselves in the foot by saying there would be confusion between DOTA2 and Blizzard. That is simply untrue and they are going to have to prove it in court. I recall this being one of the main points of contention on the whole Elder Scrolls/Scrolls debacle between Mojang and Bethesda. Blizzard has demonstrated no interest in using DotA till someone else was trying to use it. This is Blizzards MO though. Fans want something and they don't even attempt to give it to them till someone else does it first. Just look at the MMO features that were introduced to WoW after Rift came out.