Ok, I'm using a kiosk as wi-fi is in short supply, and my spelling might be a bit bad, since it's hard to type. I'll fix it later.
Starcraft II:
Terran:
Thor - giant mech. Has large 250mm cannons which ends up causing a bombardment, like a portable nuke. You can build multiple ones, and are constructed by an SCV, You need the munitions building to construct them.
Starport: new ships, and can turn into a flying aircraft factory.
New aircraft:
Banshees: Both simila and very different to the Halo Banshee, this unit may only attack ground units, and is very fat. They can cloak. One strategy when outnumbered by Marines is to cloak, let them cluster, then use their air to ground torpedoes, which are AoE.
Goliaths have been replaced with vikings.
Vikings: Like goliaths, are ground to air behemoths, but can now turn into air superiority fighters.
The "bar" in one picture(floating around the internet) is a "merc haven" and you buy reapers like mercs in WCIII
The firebats will not be returning. The devs wanted to reimagine the game without changing the core gameplay< so they have a rule that they follow most of the time, every new units has to replace an old unit.
Ghosts return, they can now also call in dropships filled with 8 marines each. Nukes now have a large marker for the launcher, but retain the small dot for enemies. Ghosts now have snipers, and can aim shots, resulting in instant kills, to marines anyways.
Protoss:
Colossus: Has shield like the Immortals, which only react to heavy attacks.
There will be no equivalent to the Mothership.
Single Player Campaign:
Instead of mission briefings, you are placed in a setting. Things are clickable, and dialougue is in trees. There are also many sub-plots to follow and Expanded Universe information throughout the game. You can choose which planet(each with it's own mission) to go to. You can also see irrelevant Expanded Universe details about each planet, even some you can't visit. The experience is described like a football. You start and end at the same place each time, but the experience getting there can be different.
Terran buy units and tech between missions and each mission has recommended tech/units. Others races, not being a group of poor overworked merc-types, will have different systems that match their races.
Zeratul will be making a return, and so far appears(seemingly for the first time in the game) midway through the Terran Campaign, which is being led by Jim Raynor.
New WoW Expansion:
WoW is getting Wrath of the Lich king, including new, interchangeable hairstyles, a new "swift spectral tiger" nightsaber mount. There was a steamboat(minus the steam, it was just propelled like a steam ship) that went from a welcoming spawn point in Darkshore to Northrend. Oddly, Northrend isn't very icy in some parts. It was only a 30 minute demo, so I only saw a small chunk. There was also aa small dungeon.
More details and videos later.