I was under the impression that this came along with some not-insignificant budget cuts (but that discussion was muddled by rights-purchasing expenses, so I don’t know if anyone really knows what the final figure is), so kinda assume we’re looking at some CGI cuts and almost certainly some scenery changes (as Supergirl’s hometown suddenly grows to distinctly resemble Canada).
Also, not network related, but it kinda seems like, with where things left off last season, there’s gonna be some story-structure changes as Supergirl/J’onn are “on the run” and hunting for dad while the rest of the team tries to cope at home. I figure that plays out pretty quick, but probably results in some relationship juggling.
None of this is to say that I’m down on the new season–I’m glad the team did what they had to do to keep the show afloat–but if S2 were more or less “S1 redux,” I can’t say I’d be sad at all.
edit: and yeah, I kinda figure there’s gonna be even more cheesy CW love quadrangles now. Maybe Kara is gonna fall for Felicity!