It tooks 28 years to make the second part of Tron. I definitely expect something great.
The encom 511 system has evolved now, better gfx, smoother scrolling, technically evolved light cycles and so on. ... The virtual world is evolving like the real world. And from the trailer I must say... it looks better than expected.
On the other hand I can understand if somebody has doubts. If I take a look a the usual remakes of old movies of tv series, it's just sad.