I'm sure there are more, but these are the ones I could think of ATM
*about mentioning former characters...maybe something about Mark and maybe Mrs. Shepherd could also come back for that, but I'm overreaching already O:)
*Maggie storyline really has a great potential, but it could also play out as ridiculous....I hope it would be handled just right with all the people involved (maybe there could also be a flashback with Ellis and Richard?...another overreaching O:))
*but it would also be interesting to watch some Merder tension first....and then of course one of their amazing make up-scenes
*theres no "seriously" anymore! :(((

Would really love to see Addie back :D

also Japril baby, Maggie's storyline and a possible return of Teddy: I'm sure it's going to be a great season!

I agree with most of them =]

Japril's baby and Meggie's storyline

SERIOUSLY, the only word I can think of to describe how this season turned out is.......let's say not polite!
I just found this poll in which I had described my hopes for the season we've seen. Ok, more scenes wih Ben ended up being the only actually fulfilled wish out of these. Teddy didn't come back and for that one I'm glad, because I fell in love with Omelia! They're amazing. The worse part is that theyended up being the only thing that made sense in the whole show. Btw, they didn't even mention Teddy and they didn't do that much with other former characters either, so GA failed at that one. Seriously wasn't used nearly enough, Maggie storyline was alright (just like pretty much the whole season until episode 20 - after that it went downhill so rapidly I can't even...), but it doesn't even matter now because the utter nonsense that followed completely overshadowed it.
Japril baby I hoped to see got KILLED just like that!
There were so many opportunities to bring Addison back and they didn't use a single one! Great doing, especially considering Kate Walsh herself said she would "absolutely make a cameo on the show"
And about MerDer....excuse me, I'm gonna bawl my eyes out :´(((((( So much for "resolving their issues"! What they did to Derek, how ridiculously it was done......that was just too much!
Well, instead of granting my wishes, they completely ruined almost everything out of these even more! I HATE GA RIGHT NOW. Well, I hate what they did to the show I've loved for years and resent Shonda Rhimes forever for ruining 10 years of her work with one script: link

I would love to see a Japril baby.