It has a lot of other new cool bells and whistles that in general make the game more varied and better overall, from the most noticeable ones you mentioned to more subtle stuff of say just tweaking some under the hood numbers to make the battles last a bit longer and therefore feel better.
Each faction also gets it's own couple significant unique mechanics as well to differentiate them more then those in TW:WH1. The world map feels way bigger (even tho math wise it's only got a few more provinces) due to the way it's designed plus the climate system enabling you to conquer more. It is also just more interestingly designed in general which adds subtle differences to the flows of your campaign, adding that little bit of variety the original was sorely lacking. The main campaign objective also changes up the flow significantly and keeps the campaign more dynamic overall, it's quite key to the whole thing, giving you more considerations of how to make use of your time and resources. The fleshed out trait system, a bit of sea exploration, events, lots more quests (at least at the start). There are also a ton of little things I am sure I'm missing just because there are so many of those little additions.
It's the sort of second game where anyone outside looking in would see very little difference from the first entry but it actually does a lot of smart stuff to improve upon the original.
That said it is also very much in the vein of a mega expansion. Think of it kind of like War of the Chosen for Xcom2. It is still at it's core the same game, just improved. There are also a couple places where they sadly did not improve enough (of what fans were asking for), such as siege battles being probably the most egregious same boring ol slop. It's also more demanding on hardware, at least at launch (it's also a little bit prettier to be fair). So it's really down to how much more TW:WH do you want? How soon do you want it? And how badly? At some point it would be smarter to recommend that people wait for a sale with the dlc bundles included for example.
Personally I am loving it. But I've also pretty much fully invested into their release ecosystem. There is a lot of stuff you get for free in various forms for getting stuff early or just together. For example I got the free Norsca faction for the first game, for getting this one, blood dlc is supposedly going to be free if you already have it in the og game, the mega campaign that unites both maps and all factions is quate a significant addition that is also free, plus they already outlined plan for a string of minor free DLCs. So I am more then happy to jump in on the action and pay for more, having already exhausted all the races campaigns in the first game. And for me it's worth it considering how much time I have spent on the first game and already have on this one. (it's put my Divinity OS2 playthrough on hold for now)
Log in to comment