Going to chime in here with what I know.
Snord wrote:Chaplain Consul with power fist => out (apparently Chaplains have no weapon options)
Correct.
Cataphractii command squad => not sure yet; I haven't seen the leaked entry for command retinues
Your command squad should be fine. The Cataphractii seem to have survived the edition transition intact, without even getting options shunted to legacies like Tartaros did.
Veteran squad with mixture of combi weapons and melee weapons => problematic. May end up as a veteran tactical squad, minus the melee weapons, or perhaps as a retinue
Yeah sadly this squad is toast. Veteran tactical squads can't take melee weapons. Assault veterans have mandatory jump packs. Centurion command squads are a decent proxy for the 2.0 foot melee veterans that everyone has,
but they still cannot take a melee weapon and any gun bigger than a pistol
on the same model, so if you gave them that they're
SOL.
Recon squad with nemesis bolters (5) => hopefully unchanged
Yep, still legal, but keep in mind their role has completely reversed now. In 2.0 they were backline snipers who traded the superior
BS of their Nemesis Seekers counterpart for Line, being able to score and snipe at the same time. This is not a thing in 3.0, they now have a rule which
limits how many
VP they score instead, so they are now inferior backline objective holders to tacticals.
Skorpius => no change (other than apparently being nerfed)
Nerfed significantly at that, but not useless.