Just completed ME3 last night and have a question going forward for my + playthrough. Any idea which romance you are attached to at the start? My save import going into ME3 had a Liara ME1 and a Miranda ME2 romance. I tried to keep both of those going in ME3 but it ended my relationship with Miranda once I paramoured with Liara (tear). So now going forward in new game + I'm thinking I either want to go Miranda or Ashley till the end. Is that possible?
A new game+ is not in any way different from a regular import when it comes to romance. You will have the relationships that were imported from ME2.