Leaving from Earth with the Ark ships isn't going to work...

So I know because of the snippets of trailer it does 'look' as if the Ark ships are in Earth orbit and shuttles are ferrying up from the surface.

But here is why I really hope that isn't going to be how we are told it happens and of course pitch in with your thoughts...

1. So the planet is round and has pretty lights on it... thats hope Thessia may look at night or another garden world... and they may have just used an 'Earth' image for speed or lazyness (never forget Tali's face )

2. To have a ton of citadel size, strange looking ships orbiting Earth prior to the Reaper invasion would have made it into the comment section of pretty much every news network and Shepard would have to have known about it - now it could be that it just wasn't an area that she was focussing on and a side briefing on a contingency plan so you can always retcon this 'off camera' but I just think it would be too big a deal for it never to have been mentioned... why couldnt I get my family onto the Ark ships yadda ya

3. Knowing the level of inflitration of Cerberus and the unknown levels of indoctrinated Reaper servants it would be madness to build or 'show and tell' a project that was meant at least in part (as who knows what motivation for building them and sending them off will be) to the entire population of Earth and the rest of the Galaxy

So my hope would be that the Ark ships were built in a secret location and staged probably over a planet (again a secret location), but not Earth, from which the passengers, members of the expitition leave to join the ships.