The game for humans is probably easier to learn. It is more unforgiving for aliens.
Dretches take 2 headshots which really makes a difference when humans are jumping, sprinting, and now dodging around. The feedback isn't there for when beginners are doing something right. 1.1, one headshot and you get the painful groan letting you know to finish them. Now, you can land a headshot and you don't really know until you get the second or until you hit them a few more times that it actually worked. Combine that with passive nature of dretches, and noobs are going to be in the dark for a while.
Basilisks and marauders are noob-proofed so congrats on that.
Goons and rants are way more unforgiving with chomp and maul. They require more precise, more wait time between them, and the POV change between classes can be disorienting in an already disorienting game. #1 complaint I've heard about aliens is they are hard to stomach, perspective wise. Now, the chomp/maul attacks are harder to hit with and in a different viewpoints.
Plus chomp and maul are on left mouse button by default, which says to the player they are the primary attacks. Pounce/trample should be left mouse and chomp/maul should be right mouse (as someone else stated) since pounce/trample have unseated the other attacks' role.
Pounce/trample are more finicky than before. You can't chain them like before (gotta land to charge pounce, trample doesn't autofire when fully charged or charge up when charging). Their damage varies and it isn't based on accuracy like say a headshot (even though every other class does).
A lot of changes make sense to a vet because we already know the mechanics. But a new player has the learn the mechanics and they will be lost as to how to make the most of it. Mainly because tremulous is already confusing enough. The side rules and little features make some stuff frustrating and 1.2 has more of them than 1.1 IMO.