I was actually going to bump this thread to ask:
What are some more songs like Alley Cat, Not an Angel and Waiting in the Wings? I know the band is known for having extremely catchy stuff, but these three songs have been the only ones that have had any lasting power. What other songs have that "single" vibe to them?
Well they only have 3 albums that are that worth listening to imo (listen to their first album without Tommy if you're a diehard, although personally even I don't listen to it...), so if you have already tried listening to an album and only those stuck with you then it just may be that you'll only get into those few songs (and I say this as a massive Seventh Wonder fan). If not, then as I said there are only 3 albums and two of the three you've picked are from Waiting In The Wings, which is their shortest album and has a lot of other songs that have really catchy melodies imo (Taint The Sky, Edge Of My Blade and Banish The Wicked strike me as having especially catchy melodies, particularly the choruses), so it may be a good idea just to try and give that one a listen, give the songs a few chances and see if anything sticks.
Alternatively, the one song that always comes to mind for most catchy and one of their best is Hide And Seek - catchy chorus, catchy but relatively heavy riff, and great overall song. Move On Through from TGE (same album as Alley Cat) also is really catchy and really has a "single" vibe to it (more poppy than Alley Cat even, perhaps). But those are just my preferences - people have a different idea of what's catchy so don't write them off if you don't agree with my selections!
(Edit: I would also second "Welcome To Mercy Falls" as an awesome but catchy and "single" type song. That, Hide And Seek and Unbreakable from Mercy Falls).
And in general - still absoutely can't wait for this album, very glad to be seeing news that things are on track