It's not territory the developer has waded into previously, but a job posting recently on their careers page indicates that Blizzard might be about to enter the business of re-imagining or at least refreshing their classic IPs.
Blizzard has begun advertising for a senior software engineer to work at their Irvine campus in California, with the engineer's primary focus to be on "restoring" the developer's legacy titles.
"Qualities that made StarCraft, Warcraft III, and Diablo II the titans of their day. Evolving operating systems, hardware, and online services have made them more difficult to be experienced by their loyal followers or reaching a new generation," the post reads.
Anyone with experience in x86 assembly, Visual Studio or debugging software written for Win32 or OSX will go to the front of the queue, although you'll also need an expert background in C/C++, five years minimum experience in development and a history debugging foreign code. The job description also wants the engineer to "combat hacking to improve multiplayer", along with introducing new features to refresh the titles.
Those interested in the actual job can go over it again here. Everyone else gets to wonder about what a refreshed Starcraft or Warcraft would look like -- or maybe a redone version of Diablo 1 in a modern Blizzard engine.
Personally, I'd bite someone's arm off just to get a refreshed Warcraft 3 campaign. I've been missing a solid RTS romp from start to finish (new ones, at least) and WC3 vanilla and The Frozen Throne are two of the best RTS campaigns for my money. But I imagine there would be a lot of interest in Diablo 2 getting a fresh lick of paint too.