It looks like a re-skin with a new name and shading turned on.
To the people saying "no rainbows" you actually do not know if there is a rainbow level as it was hidden in D3 as well. Also the lack of this level doesn't make the game great.
D3 would have been fine if it had taken the D2 talent system and a few other things. However D4 (rumor so far) looks like they took the talent tree and other things about D2 (I hope paragon is no more) and applied it to D3.
I don't see a "new game" I see D3 "done right".
That brings me to my final point. If this is D3 remade why in the hell is it taking so long to get back out. I mean they said they stopped development on D3 after ROS.