-100 Rings now give 1ups again (now they have a purpose)

-Indigo Asteroid, Crmson Eagle, Orange Rocket, and Black Bomb Color Powers can now be controlled by the analog sticks / buttons as well. (wonky on Gamepad).

-Items now appear on the world map.

-Game Overs now give 10 lives (used to be 5)

-Fixed a grahpical glitch in the casino level of Frozen Factory.

-If you have the Nightmare DLC, it can now be replayed every time you get 100,000 points.

http://blogs.sega.com/2013/12/10/sonic-lost-world-for-wii-u-gets-free-update/?0=1

The first changes actually compel me to 100% the game now, before I beat the game and was done with it.

How does these changes effects the actual game play? I found the controls on the 3DS to be... not as intuitive as I would have liked.

1ups were rare and lacking the old mechanic of getting lives via rings made them useless.

Better control of the Colors power is pretty game changing for me.

Also I forgot to mention this for the Wii U version. Changed title.

Does Wii U have a demo of this game with the new update?

Demo? Yes.

With the changes? No idea.

a few screenshots from the update =P

You're saying the rings didn't have a purpose? Now that's just stupid.

I find it hard to understand why these changes weren't in the original game. The damage has been done.

of course they had purpose, they stop you from dying in 1 hit (i would hope)

But does it support the pro controller now, for first player?

It was more once you have 20 or so rings, there was no point in getting more, because even if you had 600 (which gave you no lives), you always dropped only 20 something when hit.