Traditionally, Blizzard was always announcing titles years before they will come to life. Theo Valich from Inquirer first touch with World of WarCraft happened on ECTS in 2001, first touch with Diablo II and its add-on came during E3 and ECTS 2000 and so on. But now, StarCraft II is not being announced year or two prior to release. Blizzard has stated that the company will release this game in October of this year.
So, you can mark your calendars ready, Q4 of this year will be quite an interesting one.