Played some WotR the past few days. There are a few bugs, but nothing game breaking so far. Notably, the monitor lizard animal companion has it's model direction reversed. It does everything tail first, including moving and fighting. I suspect they just have the parent point in the wrong spot/direction/orientation on the model, but it's certainly not right.
Some ground effects still try to damage NPC's and the party, even with Feather step on, some dialogues allow the player to repeat skill checks indefinitely, but no dialogue loops.
Other than that, one of the biggest changes is, they changed traps and Trapfinding completely. It used to be (even up until a recent beta) that after you detected a trap, you just clicked on the 'detected red square' and your best Trickery-skilled group member ran over and disarmed it.
Now, there's this entirely different mechanic. When a trap is detected, there is a dotted line that leads to the trap control mechanism. this can be, and often is, in an entirely different room, sometimes protected by a different trap, with a different control mechanism. So, your rogue (normally) has to stealth around, interacting with these trap mechanisms, prior to just rushing blindly into an area.
Personally, I like it, but initially, I thought it was a bug/broken, because it was so completely different than what they had done earlier in the year.
There's also some.. strange inconsistencies in scribing spells from scrolls. PF rules state that it's limited to Arcane casters, but specifically NOT Sorcerers, yet.. Sorcs can scribe some scrolls into their spellbook.
The NexusMod Toybox works great with it, and you can respec companions back to zero if you add the respec mod, but you have to be cautious when and where you do it, and ensure their name is the same, apparently. Otherwise, bye bye companion quests.