@ Zeze
Thank you very much, kind sir, for taking the time to write a reminder of the events I really appreciate, pretty much allows me not to have to re-play SC1, SC1:BW and SC2:WoL to get it clear again. And, well, I agree... the story of StarCraft from the original up to WoL isn't exactly... hmmm... well, let's say it's not exactly deep or very detailed, to say the least (it's enjoyable enough I guess, entertaining would be the proper word, but certainly not deep or complex).
And, of course, Xel'Naga, completely forgot about that part. It's indeed a rehashed formula, in the veins of people hating each others ending up fighting together against a "common enemy" because it came out of the blue and yeah... reminds me a bit of the Dark Spawn in DAO (I.E. people hating each others and oh, suddenly them undead raping stuff around so hey let's appreciate each others long enough so we can fight those things). To be honest though story-telling has never been Blizzard's best capabilities, even many years ago... I mean SC1's story might be more cohesive but still it's no Planescape: Torment nor Baldur's Gate 2 (nor was it the goal to be similar to those either in terms of story-telling). As long as the game-play is there I guess it'll suffice. In fact Diablo 3's "story" is probably the worst Blizzard came up with so far for any of their games (didn't have to be complex but it didn't have to suck either).
So, Zerg, Protoss and Terran might end up together in the third and finale against Xel'Naga... I see. Hopefully all three of them will be able to look at each others on the battlefield without too much tension... can't wait to see that happen (and it's going to feel strange on-screen even if the story demands it).
And about the trailer again, yeah, Tarsonis, might be it and good obversation about the statue, didn't realize it was that of Mengsk. So indeed it fits with Kerrigan's so called "vengeance" in the trailer, I was wondering what vengeance she was referring to, but now I just recalled the CGI scene from WoL (or it was a teaser? can't remember) in which she's surrounded by Zerg (before being "abducted" by them) and just "let it happen" in the end, realizing that she's been left there to die. So in Heart of the Swarm she's probably going to want to retake control of some Zerg to specifically go against Mengsk but... why taking control of Zergs for that... that's the part that bugs me a bit, she could stay with Raynor and go in with squads of Terran marines. But I guess that her taking control of Zerg again will help in the third game when it's time to fight Xel'Naga trolls.
Also, Xel'Naga should play Mass Effect 3, learning the hard way how the created always rebel against the creator.