And the second hint is a little more concrete: our sister site Massively has mentioned Vollee before -- they're a company that claims to be able to stream a PC game experience to a mobile platform like the iPhone. They've already created a Second Life client, and Blizzplanet notes that in one of their recent press releases, they mention that they've been working with Activision Blizzard on a partnership. There are a lot of games under the Activision Blizzard banner nowadays, of course, but WoW is the biggest one of them, and it's definitely the MMO Vollee would want to be working on.
Blizzard hasn't officially announced any version or WoW application for any mobile platforms, of course, and even if one was in the planning stages, there's no guarantee we'd ever see it in an releaseable form. But there's definitely a call to bring facets of World of Warcraft to mobile computing, and if they can work it out in a form they find acceptable, it would undoubtedly be popular.