A japanese daimyo, one of the jurchen tribes (manchu), Anyone in India (Bengal has an achievement), Cuzco/Inca, Aztec and Byzantium would be good choices.
They've said quite a few times they aren't adding any new provinces to Japan so that won't be affected by the new patch.
The Jurchen tribes may be affected by the looting and fort changes. If Ming is smart about fort building it could become a lot sturdier in future patches so conquest may get much harder.
India currently has easy westernisation due to the Goa event for Portugal. That makes the two achievement runs much easier.
Cuzco/Inca and Aztec are both countries with massive coasts meaning the forts won't make a difference. They probably won't get new provinces and development will probably be of little relevance since they would both aim to colonise their whole continent.
Byzantium will probably get another nerf. The topic has come up a lot recently and its fairly clear that their start isn't actually that hard. I'd expect Ottomans to get a bigger, combined galley fleet and Poland/Austria/Aragon to get changes that make them less likely to ally you.