Can't wait for these suspects to drop ^_^ new toys to play with! So I'm gonna go over how I think each one will sit in the tier.
Volcarona, I can see this lasting about as long as Landorus did. The only reason why this thing would even be UU is because of all the Physical Flying priority up in OU, otherwise it is a great Pokemon and will pretty much destroy the tier.
Lucario, seems quite manageable on the surface actually. Its poor bulk and an unfortunate speed tier will make it rather easy to beat imo. It really needs a boost before it has all the damage it needs in order to sweep. The most interesting thing about it though is the priority which it will bring to the tier, something that UU is rather lacking in, and this Poke has 3 priority moves!
Goodra, will definitely be a pretty cool Special tank in the tier. Good mixed offences, great special bulk, some nifty abilities and a great movepool to abuse will make it a rather interesting Pokemon. But it is held back by its Physical Def, Speed and lack of recovery and all in all I feel it will fit quite nicely in UU.
Togekiss, if it does drop this will be the one I am most excited for. Not so much for Offensive potential, but Defensively it is something that the tier could really use, especially with some of the BL Pokemon such as Zygarde. Probably one of the more interesting potential drops.
Infernape, this one actually looks quite scary. Very fast and with good mixed stats to abuse 2 great STAB moves, I am actually not sure whether UU can handle the monkey, as on paper it looks kind of scary.
Alakazam, very interesting mon. Very hard to fill roles that the non-mega fulfils in an almost foolproof revenge killer with Magic Guard and Scarf, whilst the Mega has insane sweeping potential. Will definitely be very good in UU.
Blissey, monster wishes, great Special bulk but let down by no offensive presence and physical bulk. Finally people see how Chansey's mixed bulk beats Blissey's leftovers.