If you're avoiding looking at new confirmed Generation 5 Pokémon and want them to remain a secret, you'll want to avoid this spoiler :) . It's just something I've seen a lot of people say.
Spoiler:I've seen a few people mention Pachirisu now. It isn't confirmed, but SURELY 'Emonga' has to be a Pachirisu evo. It's an Electric/Flying flying squirral Pokémon with very similar facial features.
https://bulbapedia.bulbagarden.net/wiki/Emonga_%28Pok%C3%A9mon%29
I'd also like to see them make more use of 'gimmick' Pokémon by letting them evolve. Minun, Plusle, Volbeat, Illumise, Kecleon and Castform, I'm looking at you. All reletivly useless in battle and were seemingly just put in as a gimmick. All RSE too, oddly.
I'm not sure if Emonga would be an evolution of Pachirisu. Yes it's very similar with the cheeks and all, but it may as well be just the next "Pikachu" electric type. By this I mean every region so far has had its main electric type as well as its normal type (recall, zigzagoon, bidoof). So Emonga could be the region's main copy electric type pokémon. If it does happen to be an evolution of Pachirisu, I guess it just grew the ability to fly and gain the color of black and yellow. owo;
Farfetch'd deserves to have an evolution. I'd like to see what they can do with it if they decide to. There are a swarm of pokémon that get a lot of attention and the left out ones become more popular and more wanted. However, if Farfetch'd gets an evolution and becomes one of the swarm, I hope it doesn't turn around and become another less wanted pokémon.