I'll only go into revisional details assuming you haven't ever watched GITS and checking out which version to watch. The major difference in 2.0 is the un-matrix-isation of it. GITS was a green movie, in revision it is shifted to a red hue. This makes it way more colorful than intented and a bit disrespectful to Oshii. The introduction sequence is mostly redesigned with 3D additions, it's quite good and gives the impression this will be a complete revision of the original (which is not the case). The credits Matrix copied over is completely taken out. Lack of transition between newly introduced 3D with the old2D is extremely uneven and confusing to the audience. There are some panoramic sequences of the city very similar to GITS: Innocence, they manage to fit in, but character 3D ruins it.

I didn't notice any difference plotwise, so if any is present it should be minor. My dvd copy of the original has lots of artifacts, especially in the dark scenes. They did a good job digitally cleaning the film on 2.0.

Overall this renewal feels clumsy and makes GITS more generic than it is. Only a blu-ray renewal should have been more than enough. If this'll be your first time with GITS I strongly advise watching the original first. If you are checking it for a rewatch there is no harm with trying 2.0.