Okay, in the old codex IG, an infantry platoon was counted as pretty much a single unit for all intents and purposes, whether it blobbed or not. So if you kept it in reserve you made a single roll and brought the whole platoon in at the same time.
However, it no longer makes that stipulation in Codex AM, it just states that if you choose to combine squads the new larger squad counts as a single unit from that moment on, and must be done before generating warlord traits; but it makes no mention of how a platoon may arrive from reserves; so do I assume from that (until GW FAQ if they do otherwise) that I roll for each squad now? It would make sense otherwise you could not have a squad in a Valk with 2 others on foot unless you can treat each as an individual unit.
So what say you guys? Single unit? or just there to be broken up like Marines can with their combat squads? Well, not exactly like that but you get my drift.