To start... Like many SC2 fans I adored, nay... Still adore that game. I play it through about once a year and loving UQM in recent years. I generally do not replay many games! Now the reason I do this is not for the story - Its burnt into my memory. It's not for the melee - I've reached proficiency several times through the years and its definitely fun, but its not for that. 

So what is the reason I keep playing SC2? - Short answer is that its for being in space and on planets.

So what I really liked in the teaser:

• The ships 
• The lander animation
• The alien
• The solar system (except for the severe, almost stress inducing, speed of the orbits)
• The production value

What I did not enjoy so much:

• The uniform reddish space - space is black as night with shiny star jewels and dark rocks in it. A few nebulae and other interesting features I could go for. 
• The siren - with fps-game-i'm-bleeding-out even more redness - Some red lights reflecting off a console would be soo much better.
• The omni-present cartoony style. 

• The autopilot (if I'm not mistaken) - I like being the captain of my own destiny.
• The resource picked up on the planet - I don't know if that was a relic, but I rather enjoyed picking up actual elements, and a few exotics, and knowing from my scanner exactly where they were and having a general idea of how much. (I mean who didn't get a joygasm scanning Alpha Centauri III and VIII?)
• The lack of cosmic radio noises - I need my old-school sci-fi vibes.
• The ring of flames solar system entry - Burning space when passing between dimensions just feels... off. I totally enjoyed the semi-mystical, undiscovered physics, so-that's-how-the-universe-works, OMG-its-full-of-stars artistic license TfB took in SC2 warping/merging in and out of quasi-space, hyperspace and real space.
• The my little cutie planet - Just No - The rolling is not a bad idea, but the tennis ball size... Please. And a mini-map is not optional - It must be there.

All that said I probably WILL play SCO as a hardcore SC fan. I dare say it will be nigh impossible to make a worse game than SC3 for Stardock games (great respect). And I would be remiss if I neglected to note that it looks good. It does. And we have not seen much of it. Some of my observations might be in error. I really just do not want to end up feeling like I'm paying for a name only. The name and the spirit, without the lore... I can dig.

I just need my old-school sci-fi vibes. I really do - So much....