-Okay
-Only a very general release date, subject to change
- Looks like a sci-fi shooter to me
-in blink-and-you-miss-it shots
-which two?
-Ooh! A gun!
-Okay I'll give you the Mako
-Targets to shoot at
How about story? this is supposed to be a narrative-rich RPG as well, isn't it?
For starters, how the frak did humans get to Andromeda to begin with? What are we doing there? What sort of crisis are we facing? When does this take place?
And finally, how the frak did humans get to Andromeda to begin with?
- People have been pining for a title for so long. Now BW delivers and it's just "okay"?
- Oh come on. "Holiday 2016" is quite specific, it means November to December 2016. And they never said "subject to change" AFAIK. And if they did, how would that differ from other games, where even to-the-day specific dates are being moved mere weeks before release?
- Oh come on Reloaded. You'd have preferred some wireframes instead of an approximation of the graphics of the final game?
- So? Why shouldn't the teaser serve some tidbits in a kinda hidden way?
- The super-jump and the ME3-Multiplayer-Turian-Omniblade-thingy
- Sure, it's quite inconsequential, but it's an appropriate refutation of the "they showed us nothing" claim
- And the Mako counts twice at least 
- Oh come on Revolutions. You'd rather see no enemies at all?
And for the rest of the questions: do you really want to know all of that beforehand? Don't you want to experience that in the game itself? If not, I have a solution for you: go visit the Wikipedia page of ME:A in early 2018 (by then it will have come out for sure) and read up on the plot. That saves you a lot of time and money. You're welcome!