Hmm. If I was starting a campaign today, in 074, and I was thinking which faction that I could play now that wouldn't be really overhauled in 080, knowing what I know, I might try Epeiros or Getai maybe. There are probably new units for every faction, but I don't think those get a flood of new ones. I wouldn't touch anything Nomadic though yet, nor Roman, and probably no Baktria/Seleukid/Ptolemy one either, or eastern factions. Lots of building changes and unit additions. I don't know as much about barbs honestly though. But your 080 Epeiros experience would be less dramatically affected than some other factions. I really can't say anything else though.