First impressions:
1. The initial choice between the cults is a bit forced and a non-choice. You only get to see their equipment, but you don't get to talk to them about their intentions, goal or why exactly you have to choose between them. You can ask the Emissary that, but he gives you a non-answer. You do talk to them, but they give you vague answers which don't really help in a narrative sense. It's kind of disappointing that more writing has been thrown into the lore notes you find scattered throughout rather than the main factions in the main storyline. You gain rep with all 3 of them, so whatevs. You are still forced to work for heretical witch cults, which doesn't work for some masteries, like the Inquisitor, I would've preferred a fourth option, but eh.
2. The map is gorgeous with a lot of detail, at least the first areas you go to. We'll see what they've done as a whole, but it's both less cluttered and more detailed than AoM. Less boring and repetitive too. I think it's a bit cheap, however, as the Egyptian thing going on gives it a lot of flavor without having to be all that creative.
3. The movement augments are both a blessing and a curse. I find the teleport really useful for my main, as I frequently find myself surrounded and can't get out if I have to, now that is taken care of. The curse is that every build ever will have a movement ability now, which decreases the value of mastery movement abilities and makes them a bit less unique. Teleport doesn't work as advertised either, it's not that big of a deal, but you can't teleport through gates or through walls, it's kind of random when it works through an obstacle and when it doesn't.
4. The new enemies are much better designed, with more polygons and less janky movements. They still vomit shit all over the ground, obscuring whatever is happening, but it's also not that important, it's only important if you have to watch out for telegraphed attacks, like Zentarin, the Immortal's chaos shotgun attack.
5. The Shattered Realm seems like a good idea. It's basically Diablo 3's riftgates or whatever they were called. It's not bad at all and it gives you a lot of options for farming. I only played a single shard (each shard is divided into 4 chunks [actual terminology], at least the first one was divided into 4) and I got a unique boss I haven't seen at the end, I don't know whether they are unique, new in FG or I just haven't met them. Some of the chunks feel randomly generated, some don't. All in all, I think GD is the most versatile and gives you the most variety of any hack and slash ever.
6. Some of the lore surrounding the new enemies is a bit predictable, like when I read "The Sting", I immediately knew what that's about and what will happen.
7. T-rex. That is all.