By James Hibberd
Updated March 04, 2011 at 05:56 PM EST

Winter — at least a sample of it — is coming sooner than you think.

HBO is presenting a 15-minute preview of the premiere of Game of Thrones two weeks before its full fledged scheduled debut date. The preview, which will air at 9 p.m. on Sunday, April 3, will be immediately available on and On Demand, to help further ramp up hype for the show.