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EDIT:
Deleted the original post content, not only because it was completely obsolete, but because most of that was lost.
New unit list is based on the planned progression for RoO's original single player campaign with some small additions.
Names in cursive are not necessarily final, but are unlikely to change
Subfaction names are not decided yet.
Subfaction A is based on fast response (fast for GDI, which is still slow).
Subfaction B is composed of heavy mech armor with light infantry units.
Subfaction C is composed of heavy infantry with lighter units.
Units are basically described by their main role/quality, many of them might have secondary roles that will be posted with the unit in their respective section.
As an example Mammoth Tanks might function as static long range artillery units when deployed.