Starcraft 2: Heart of the Swarm - Multiplayer Discussion

I remember playing Starcraft a long time ago and loving it - it was one of my favorite strategy games, along with Command & Conquer, Age of Empires, Sid Meier's Civilization, etc. I always thought it was cool to be able to raise an army and compete against another player (or A.I., whatever) for dominion over a map. I thought Starcraft was particularly awesome because it seemed like all of the three available factions had pretty balanced advantages/disadvantages. When Starcraft 2 came out I was blown away at the upgrade in graphics as well as gameplay, but how it also managed to retain a great deal of the old style that we came to love, in my opinion. The story was interesting, although one of the major "twists" wasn't exactly difficult to see coming. Regardless, I am looking forward to the next installment, Heart of the Swarm, in which the Zerg will be the main focus, with Kerrigan at the command (won't get into it mainly for spoiler reasons - however I will say that it will kind of work in an RPG style, which is interesting). While I think we've established I'm looking forward to this game, what do all of you - who are interested - think about how this game will be different from Starcraft 2? I can obviously glean that the story will be different, and with new units and characters making an appearance we will have our hands full, but what about the rest of the multiplayer aspect? How can they make that substantially different than Starcraft 2 when all the units from each faction are made available for you already? That is, while the single-player campaign primarily allowed for the control of Terran forces and the same with the Zerg in Heart of the Swarm, and with the multiplayer from Starcraft 2 allowing for all three, how can we expect the multiplayer in the new game to be all that innovative? I pray that I am wrong about this, but I believe it is worth mentioning. What do you all think? Here's a video of Heart of the Swarm from YouTube: