Hopefully the AI will offer more realistic trades
At the very least, the AI has more awareness of their situation so shouldn't offer you trades against their self-interest.
But mostly, all the GMs now have something like 10 new ratings, everything from a trading frequency to their own evaluation methods, so mostly instead of playing against the "OOTP AI" controlling all 30 teams, you now face 30 unique GMs. So if you're lucky, your league will have 29 Ruben Amaro's you have to face off against. If you're unlucky, you might have 29 Theo Epsteins.