Almost everything here came out of the forum. Thanks for reporting, that is how you find what is missing.
Squad
Players out on loan were invisible to you. They sit in the squad of the club that borrowed them and showed up nowhere in yours. The new Ins & outs tab lists them: who is coming back, who is arriving on a pre-contract, who has to return at the end of the season and who leaves on a free. All with rating, contract and club.
The player card now names the fee you paid. Before, it only measured an offer against market value, not against what you spent yourself.
There is a rating history too, one point per transfer deadline, so twice a season. Whether that 77 is a climb from 71 or a fall from 83 was written nowhere. And the arrows at the top page you from player to player, in the order of the list you clicked from.
Auto line-up
Two new rules. Higher rating lets the number decide instead of the learned role: until now a left winger on 35 stood ahead of a central midfielder on 50.
Rest players below puts tired legs on the bench by preference. By preference, not by ban: if eleven do not come together otherwise, he plays anyway.
Transfer market
Pre-contracts and signing bonuses had a hard floor of 50,000 euros. In tier 4 that was 6.5 times market value: a player worth 7,700 euros cost 50,000 in signing money. The floor is gone, prices now scale with size.
World
Clubs without a squad and without a crest: there were 32, now there are 15. Every section gets its real club count instead of the average of its tier. In tier 3 of Czechia one league holds 32 clubs and another 18; both were given 24 slots, and the world builder filled the gaps with invented clubs.
The second tier of Northern Ireland was called "Championship " with a trailing space. Found while modding.
Everything else
Hint bubbles were cut off at the edge inside windows. They now float free and stay fully on screen.
In the auto line-up rules panel every value stood there twice, and the dividing lines ran out of step.
Tell me what you notice.