If your that "lmao" about the guy who didn't read, you really shouldn't ask that second question for yourself, i've given loads of informationr egarding the current progress all over the forum.
(Except your question was meant to be like "how much code has to be changed for porting IC² to 1.0" in which case you should worry about your grammar and would get the answer "Can't tell yet".)
The next question of yours is kinda dumb as well, as the obfuscation changes every major update, it's impossible for mods to be "backwards" compatible, regardless of their size or whether they are extending a mod's function. What do ya think why we need to port IC² every time?