- Eden Prime: Likely won't. I don't want to.
- Noveria: Likely won't. I don't want to.
- Feros: Likely won't. THOUGH, I kinda want to again.. if only a smaller version just meant to show the colony in different states...
- Terra Nova: Likely won't. I'd like to though, but with us going to Earth and Mars already, Terra Nova as well wouldn't make sense.
- Illos: Likely won't, and its served it purpose imo. More prothian locations may be in the cards though.
- Citadel - Wards From ME1 & ME2: Likely will, in some form or another.
- Citadel - Presidium From ME1:
**NEARLY CONFIRMED** Very likely will, in some form (even just a cutscene). I really hope we actually head into the undiscovered heart of the place

- Omega: ...probably won't (as it looks like we have moved from the Attican Traverse of ME1, to the lawless Terminus Systems in ME2, to the more important Citadel Space of ME3), but I want Aria and Omega involved in some way...really badly :S
- Omega 4 Relay - Collector Base: Won't visit it imo, but it may still play a good role.
- Shadow Broker Base: I really hope so.....
- Normady Crash Site: Nope.
- Pinnacle Station & Shepards Apartment: Nope! And I'd hate if it was in the game anyway.
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- Virmire: Nope.
- Cerberus station: Nope, but probably other Cerberus locations in some form.
- Freedom's Progress: Nope, but I wouldn't toss out the possibility of other human colonies.
- Illium:
**CONFIRMED** I believe it is mentioned that we can return here. Yay

- Tuchanka:
**CONFIRMED** There will be missions here. Yay

- Bekenstein: Well.. there's a possibility of returning in some way, but probably not.
- Haestrom: Probably not, but dark energy-related locations may be in the game.
- Korlus (Junk World): Nah.
- Therum: Nope.
- Hoizon: Nope.
- Quarian Fleet: I'd like that! Or at least it being involved in some way.
- Jacob Planet: Nope.
- Zaeed Planet: Nope.
- Purgatory: Destroyed, lol.
- Geth Bases: Maybe?
That's all I can think of.