I haven't been playing much lately but Emboar moving up to Ru was a big surprise to me.
Amoonguss was also a surprise but I've been wanting that thing kicked out of the tier for ages so I'm quite happy.
Cinccino and Absol were obviously gonna move up sooner or later and I help them along by spending December playing with them in RU.
As for a Amooguss Replacement, I'd say Tangela is a solid bet to increase in usage, it'll be like the early days of NU before Amoonguss ruin Tangela's day.
I'm more interested in who's gonna replace Absol and Emboar. Well Skuntank will pick up some of Absol's slack, who's the gonna pick up the rest of it? Cacturne? Shiftry? Sneasel?
As for Emboar, the only physical Fire type I can think of is Rapidash, nice speed, morning sun for healing off recoil and hazard damage and wild charge and megahorn for coverage but will sorely miss that secondary fighting stab.
I can't wait to play the new NU.