I haven't gotten my hands on it myself, and to be quite blunt Americans will have to wait a bit longer for it, but Sonic Lost World's been released in Japan and Europe already and playthroughs as well as reviews are being put up. The game's getting mediocre to average scores across the board. Some controversy's stirred up, though, because Gamespot's review was atrocious and they were blatantly throwing away lives at least twice.
The general opinion from what I can gather so far:
[spoiler]The plot's better than Colors and Generations, a bit less of characters standing around cracking jokes nonstop. The base gameplay is good, if a bit spotty due to Sonic trying to run up walls a little too much sometimes, but three problems seem to crop up all the time; A.) the game can be difficult, complete with insta-kills late game if you're not careful (although the bosses are pathetically easy). Some people compare it to the trial-and-error of Unleashed, or Donkey Kong Country. B.) like how you had to collect Sun and Moon Medals in Unleashed to progress at certain points, you have to rescue animals by numbers to progress in the story, which can catch up with you late game. Thankfully, animal capsules are grindable and abundant, and if you go to one of the minigame Circus acts that pop up randomly, playing good can get you a couple hundred rescued animals or more, so it's not anywhere near as much of an issue.
The main problem most people can agree on without splurging into anti-Sonic or anti-reviewer rage is that the game is just not all that fun when you're not playing a standard level. They throw lots of stage gimmicks and one-shot designs or uses of the Wisps around for the sake of variety instead of focusing mainly on the platforming, and the result is that the game feels rather sloppy because the gimmicky stages are [parasitic bomb]. The platforming at its base level is actually pretty good, if in need of traditional refinement, but it's undermined by the rest of the design. Also, Wisps don't factor into the plot at all, so yeah, they're just more gimmicks thrown in because Colors team.[/spoiler]
In terms of Super Sonic:
[spoiler]Yes, he's here and playable, albeit probably not in boss fights again. His Spin Dashes go off more like a Boost which is reasonable here and without extra ring drain at that, and he's of course faster than normal Sonic. One ring a second just like the classics, and because the Wisps are pretty much entirely ignoreable in this game, that means no awkwardly altered level design to accommodate like Colors, and no gimped bullshit like Generations. I'm not sure if it's the same super tedious method like in Colors via all the red star rings, though, so keep your eyes peeled for that. Seeing Super Sonic tear ass through the 3DS version's stages was satisfying, though.[/spoiler]
EDIT: [spoiler]So it turns out yes, the Red Ring collecting is the method to get Super Sonic in the Wii U version as far as I can tell. Apparently the 3DS version has actual special stages.. .. with gyro controls. Egh. At least the Red Rings aren't a colossal search-to-find nightmare like in Colors from what I've seen of the first two zones.[/spoiler]