Well, you're in luck, Locke! So yeah, I went to the Eurogamer Expo yesterday, and while there was a lot to do, I was primarily focused on the main three: Nintendo, Sony and Microsoft. (I'll post my thoughts on everything non-Sonic-related in another topic.)
Anyway, I've now played both Windy Hill 1 and Frozen Factory 3 (the casino) on the Wii-U version and I definately prefer the former, but that's probably because it's the first level of the game rather than the third level of the fourth world. Also, there are many more paths to take in Windy Hill, giving the player more freedom, compared to the straight-forward, yet very difficult casino level. One thing that also caught my interest (and I don't know if anyone else found this out before) is that when you start Windy Hill 1, you can see Tails fly off in the Tornado (I'll try to find a screenshot), which fits in with the opening cutscene that was recently revealed.
Meanwhile, I've now played every possible demo level on the 3DS version. Overall, I think it's on par with the Wii-U version, given its limitations. One thing that's changed since the Summer of Sonic demo is the timer, which now counts down just like the Wii-U version, giving the player a set time limit. (We'll have to wait until the full game is released to find out if this was a good or bad idea.) Also, the transition between areas seems to have changed; Now, when you hit a giant spring, the screen just fades to black and then you arrive in the next area (with one exception: the snowboarding section of Frozen Factory). One major difference it has from the Wii-U version is that the 3DS version still has ranks (most likely S-to-D like Colours and Generations), which I kinda prefer, as it gives me a reason to replay the levels. (It also makes it less Mario-like.)
As for the controls, I think they're... okay. As many people have said before, the controls can (and most likely will) be confusing and difficult to learn when you play it for the first time. However, since my SoS playthrough, I'd say that I've grown to understand the controls much better. Here's a quick heads-up:
- Pressing A or B in mid-air will make Sonic either double-jump or Homing Attack enemies within range, just like Sonic Colours.
- Pressing Y or X in mid-air will make Sonic either bounce (up to three times), perform a Homing Kick (Wii-U) or a 'wind slash' to stun enemies (3DS).
- Pressing Y or X on the ground will make Sonic perform a Somersault in the Wii-U version, but I don't know if it's even useful or not.
- Holding ZR (Wii-U) or R (3DS) makes Sonic run, or you can charge up a run by standing still and holding ZR (at least, in the Wii-U version). Anyone who's played the DS version of Super Mario 64 will probably understand how that works.
- Holding ZL (Wii-U) or Y (3DS) will rev up the Spin Dash, releasing will launch the Spin Dash. The longer you hold, the further you go. Same as always.
I'm not sure if the Wii-U's L&R buttons do anything... yet. Anyway, that's my early thoughts on Sonic Lost World. And with less that a month to go, I can't wait to get my hands on it. (...Well, the 3DS version, that is. I still don't have a Wii-U sadly, but I'm sure it won't be long until I do, and Lost World will be my first game.)