First thing I did after running around the village vacuuming up side quests was try to do the mine stuff. Jesus Christ, I actually had to leave the Vithrack part with 2 fights remaining to rest at the inn. Went back in, beat up those 2 fights, then went in to the 'boss' room and got absolutely destroyed, the tentacle mobs 3 shotting my toughest party members, ended up going back in there only after completing the part 2 main quest. I guess I should have checked my bestiary, them being level 13-15 was probably my queue to get out. Odd to put the hardest encounters (besides the new bounties (the one in dyrford crossing being the best) and those in the new cragholdt bluffs equivalent area, which was excellent for a 16 party) in the closest location though, I suspect I'm not alone in thinking that was a good thing to do first.
Most of the new soulbound weapons are good, still not happy with how you upgrade most of them though (kill x enemies, one even has kill x enemies with a critical hit, thank god I still had ~1/2 of act 2 and all of Od Nua to go, actually going for that against same level enemies would suck). The sword had a broken ability, forums say I should have got something that lets its attack target will instead of deflection, but I just got "Missing Ability-1".
The final boss of part 2 main quest seemed to do practically nothing, the tentacles immediately surrounded my whole party, only to get absolutely shredded by barbarian carnage/spark of the righteous, meanwhile the head just sat up the back. After the tentacles dropped everyone just auto-attacked the head to death then some eyeless came out. No one even dropped below 50%. Thaos was tougher imo. Concelhaut and his new rival are the best boss fights, but having similar difficulty on the crit path might upset people.
Monk enemies remain the most dangerous non-boss foes. I don't know what's up with them, I think maybe they don't use resources? A few times they seemed to do that "charge target, damage those in path" ability right off the bat, and that should cost 3 wounds. Then they just hit super fast and hard + have high defenses.
Act 3 scaling wasn't enough to bring the enemies up to compete with a 15-16 party, I'm not even sure which fights were buffed. I didn't really notice encounter reductions too much, did notice some new group compositions (eg. sporelings among Dyrford Beetles, druids among burial isle spirits, a lot more Adragans all over the place really.
The new Keep stuff is pretty cool, the quest chain ending in a battle was great, especially the CYOA-giving-orders bit and the allies based on what you've done. The minor, major, grand adventure stuff have all been given text telling you what you're sending your party members to do and more text telling you how it went when it is done. The item rewards from them are now very interesting, often limited use, quite powerful abilities eg. a 7 use resurrection item, a 5 use suppress effects on enemy item, a book that goes in your pet slot and has 1 cast of a variety of spells. Still can't fail them and it's quite absurd what they get up to in such a short amount of time (it's based on you completing/progressing quests, so they occasionally go all around the world in a few minutes/hours
).
The new Cragholdt followup was great, but probably too easily missable. You have to go to stalwart village after killing Concelhaut, but if you play it un-scaled like I did, it's not unlikely that you'll be completely done with stalwart before you go to Cragholdt. I only ended up going back because I could see that the legendary enchant for armour required bog dragon's scales and I was ready to comb the whole damn place for something I missed, only to find the lead in in the middle of the village now that I had murdered Concelhaut. I don't know, maybe have the stronghold receive a message if you're 16 and Concelhaut is dead? The new spells you get from her grimoire (if you kill her, you can end this one peacefully for an alternate reward) are amazing, sans the highest level one which is only really useful for her to use on you (it conceals HP and causes sickness, I don't think the AI would mind). My favourite was the summon weapon, it's auto attacks leave a ball at the targets feet that explodes in a little while for huge AoE raw damage vs reflex. That combined with alacrity of motion (haste) is devastating damage.