"Vengeance is coming."
Blizzard will reveal the trailer worldwide today at noon PST on TwitchTV. The channel already has thousands of viewers in anticipation of the event, which will include a HotS showmatch featuring eSports pros.
Blizzard says that along with the release of the trailer and the showmatch, several of the company's developers discuss the Vengeance trailer as well as the HotS expansion. Fans can ask the developers questions via Twitter using the hashtag #Vengeance.
Blizzard started promotion of the Vengeance event by giving pieces of the trailer's poster to several eSports professionals. These pros then tweeted the pictures, allowing fans to piece them together into the final poster. The poster, as well as the eSports pros involved in the promotion, can be found on this Team Liquid forum.