So I just got done with my 2 hour run on AC Mirage, they really should have done 3 hours for the trial period considering the cut off point I hit, but anyways figured I'd share my thoughts...
The skill tree (at least early on) has been severely downgraded from hundreds of options to about 21 making it much less daunting...but that also means there will still be leveling and RPG aspects, not a total killshot but worth noting.
You also still have all your armor slots and costumes, which isn't a bad thing, it didn't ruin AC Unity entirely although it was much more irritating in that game than even modern AC titles, the original gameplay made it bearable...I didn't get far enough to see how its going to work this time around since I only had a sword and a dagger. Interesting note on that fact is it seems you use a sword for attacking and a dagger for parry, which could make for an interesting twist or a game wrecking shitfest...I may never know
All the controls, stealth, and targeting that was a complete disaster in Valhalla seem to have been fixed entirely (thanks for leaving the broken game broken Ubi)

but the worst one of them all in Valhalla was Assassination and I didn't even come across mention of any means to do that in the 2hr run

don't tell me they removed the fucking hidden blade again lmao.
All in all for the two hours I played it seems much more solid and old school style than any other release in the series since Syndicate and if Ubisoft wasn't acting like the new Blockbuster Rental store I may have considered picking it up honestly. Damn shame they fixed the game to the point of it being playable, ruined the client by removing offline mode, and hired some retard who thinks we're going to pay to play on single player games until they decide to kill the servers.
I won't be buying it on pure principal unless it hits the price of the racing game they just screwed everyone on, but I almost wish I could
Morale of the story is...yeah lol.
We, the gamers, keep the lights on Ubi. The honest ones. Don't start fucking us over or the lights go off...your not bothering the Pirates, except the ones playing your game lmao.