So you think WoW cannot be on a handheld (I agree by the way), but Heroes of the Storm can be? Good luck trying to play Dota/HoN/LoL on your iPad. I'm sure it's a mistake which they can edit later on. Maybe it was even just rushed and they used the same lawyer as with different copyrights (was in NZ just as the Dark Below was) and he just copy pasted from the last request he made. Plenty of possibilities, but I do think it will be WoW related.
Thinking it's either HS related, which hasn't even been released out of beta yet, or an ARTS compatible with tablets makes me think you just don't like the name and are in denial. Could be unrelated of course, but I'd rather doubt it considering the name to be honest. We haven't seen anything of HotS yet, so shouldn't be that, and we are already playing a beta version of HS, so shouldn't be that either. Can't be Diablo or SC related because different universes which pretty much leaves it to be either WC4 or WoW X5.