In the meantime, a downloadable alpha of WC III has come out (it's available
here at
PocketGaming.de).
It's certainly a WC III clone (most icons / units are the same) but still lacks a lot of essential WC III features. For example, dynamic terrain levels - now, it seems it only has two terrain levels (as was the case with Starcraft but unlike WarCraft II, which had no notion of heights and for example the range / visibility implications of putting units on a hill).