I would love a full fledged sequel like B2W2. I feel like they set it up pretty well, especially with the talk of minor league gyms and the like, as well as some good character progression for the rivals that could be continued in a sequel.
After today's trailer, I'm absolutely going to have an Obstagoon on my team. Zigzagoon is an old favorite of mine and I'm hyped.
Still leaning towards Sobble as my starter. Also interested in Rolycoly, Yamper, and Corviknight.
Definitely picking Sobble. Everything else depends on evolutions really. I do like Yamper and Corviknight though, especially. Considering a couple old favorites like Togekiss, Butterfree, and Tyranitar but I'll probably stick mostly to brand new mons.
XY had a significant number of Gen 3 Pokemon one year prior to ORAS. And we've already seen quite a few Gen 4 mons - Lucario, Hippowdon, Abomasnow, Vespiquen, Rotom, Rhyperior, Glaceon, Leafeon, Munchlax, Togekiss, Weavile, Mantyke, Gallade, Roserade, Dusknoir, Frosslass, Drifblim, Bronzong. So...
It's hard to say, really. I think Gen V is probably the best overall, but I also have really soft spots for Gen III and IV. IV started out rough, but I'd say HGSS is maybe the best game in the series. III lacked some of the quality of life changes brought later but it was really enjoyable...
However it is technically possible that some evolutions could change due to regional variants and that some old mons might not return as they were previously known but with a new form.
I hope at least.