Well the stuff that's been proven accurate has been the following:
Majority of 1984 G1 will be finished before Part 2. Leaving Part 2 and Part 3 to be all late era stuff for the majority.
Micromasters will continue for all 3 lines
Targetmasters will be present for all 3 lines
Then there's the high possibility but no hard evidence yet:
Larger Size Class Weaponziers
Deluxe and above being packaged with partner figures for part 2 and 3.