From what I've read in articles, I don't think they're going to make Sounwave a cassette player, they'll be making him something a little more modern. I would guess that Ravage, Rumble, Laserbeak, and the rest will transform into compact discs instead of cassettes. Personally, I think they should just leave them as what they are, but I won't mind a few changes as long as they aren't too drastic.