Disney Tourist Blog just posted about this. Apparently, they are letting IG crowds and front of park crowds all clump up in the Innoventions breezeway with a "fill all space" mentality until they actually start walking right around 8:30. So, definitely a feasible RD from IG or front, but, with the filling in, people who show up after you could well end up in front of you while you all wait around for the march to the attraction to begin.
This is still a very new procedure, so they could well change this and test other ways in the coming weeks.