Well...
First of all, the expansion a year later has proven to be true so far, therefore it is most likely we will see the WC3 exp next July.
Secondly, if you know Blizzard then you know there is no way WoW will come out in 2003. I still remember the advertisment for Diablo 2 to be released in 1998 and WC3 in 2000. And besides that Blizzard is very deliberative about development process, making a MMORPG is very difficult. People assume because Sony/Verant succeeded that it is easy. Look at Squaresoft, I'd say them and Blizzard are equal in terms of development ability, money, ingenuity, etc. and it took them a while to get FFXI working properly. We would be lucky to see WoW by Christmas '04.
As far as Starcraft: Ghost, Blizzard isnt actively developing that, Nihilistic is, so they wont have resources working on it. Plus it's a console game, different game entirely.