I have been keeping my thoughts to myself, since I wasn't sure if this "leak" was real or fake. Either way, I am satisfied.
If real:
-The abilities of the new Regis are cool, expected, but cool. If they have decent to good attacking stats, they will be very good wall breakers potentially. Between Regieleki with Rising Voltage in Electric Terrain, and a full HP Regidrago using its signature move at max power, boosted by their abilities...yikes. The only thing is I wished they added similar abilities for the previous Regis, they could really use the boost. Plus, it is not like it would make them hax, as Regice, Regirock, and Registeel have poor to decent attacking stats anyway.
-I actually love that the Galarian Birds' shinies are just their normal forms colors. I find it pretty cool actually
-I like the horses, especially the Ice one (I love my ice types), and really hope they are viable. If they are decently fast with good attacking stats, I could see them being very good. Ghost horse as a fast special attacker with special moxie could be fun to use, Special also favors the Ghost typing a lot. The Ice horse as a fast physical attacker with moxie could be really really good. Ice types are great offensively, but really bad defensively, so if they give it speed and power, it will be very good to use. Design wise they are good, but just like Urshifu, I feel like they were just leftover regular pokemon that they decided to just make Legendary for the DLC. I still really like Calyrex, and cleric pokemon are my favorite, and its pokedex entries seem to hint that it has healing abilities. I'm hoping it is bulky as heck, and when fused, it retains its bulk but gains attack/special attack/speed of the horses. I like the fusions overall, but I'm hoping they change typing to make them a little bit more unique. Also two abilities at once is crazy!
If fake:
-I'm not gonna lie, it would be fun it they were, as it would mean even more surprises in the game, plus it would leave hope still for some new Galarian forms (come on Jynx!!), as the leaker said there was nothing else new in the game.