I'm no expert but I was told somewhere that there was a Protoss symbol on there as well...meaning Blizzard is simply hinting at all its previous franchises before revealing a new franchise, because they have done that before.
LEFT4DEAD411.COM
Bet with disolitude: Left4Dead will have a higher Metacritic rating than Project Origin, 3 months after the second game's release. (hasn't been 3 months but it looks like I won :-p )