I'm fairly optimistic about seeing Serbia in, at least. Most people considered their song a borderline qualifier at best in the run-up to the contest, but they managed to bring everything together well and end in the top 10 on their returning year - surely they can't complain about that.
Moldova withdrawing seems unlikely to me as well, though I think in their case it might just be my heart speaking out over my mind. They've been in the contest every year since I started watching, and I've enjoyed their entries almost every year, so I'd miss them for sure if they sat out for 2016.
Apart from that, I'm still hoping to see Bosnia and Herzegovina back but don't think it'll be likely; meanwhile, Turkey and Australia look like they're both a 50/50 to me.
I'll be happy enough if we can end up with another 40-song contest, I guess. More is always better, but somehow having that '4' at the start makes it look more satisfying.