Snuck out?
I couldn't watch a single youtube video without seeing an ad for the game.
Every gaming website I visit had multiple ads on each page.
Facebook had something on the sidebar.
They had a massive launch party, which was advertised in the games launcher as well as on several websites.
If anything, this launch was bigger than WoL. It was actually pretty cool.

Also, Starcraft Universe has made it big on the SC2 Arcade. It's just the prologue up so far, but go check it out. It is extremely cool. Awesome fan made project, totally worth a look.