"
Job Update 3/20/06 New Position: Game Systems Designer
Blizzard Entertainment is looking for a talented and experienced game designer to work with the developers of Diablo and Diablo II. Duties will include working on general game design, rules systems, play balance, interface design and multiplayer features. Check out the
Game Systems Designer posting for more information."
that was the closest thing ive ever seen to official news of Diablo:III
but yeah if it does come out it would be after WOW:BC and i think starcraft ghost was thrown away i dont think its ever gonna come out
p.s.
http://blizzard.com/jobopp/ is where i got the above quote