I like the looks of this. (First time I'm here since this forum update.)
The only thing I really don't like is this infinite-scrolling thing, which for some very odd reason gained extreme popularity over the years (as did many horrible web design practices). It's not infinite, ofc, but it feels never ending. I'd much rather have a list of pages at the bottom. It makes it possible to follow a big thread as you have time, and it gives you an immediate view of how big it is and how far you are in it.
It's also bad for looking at the posts that were made before. You have to click "load more". I found myself many times in the past looking through older posts to see if I could help anyone that hadn't been helped (I don't come here often, but when I do I tend to look around), but with this system, if I want to get back to where I was the day before, I'll have click "load more" some 10 times or more... It's prohibitively annoying to go back too far.
I don't know... I don't want to sound like nagging or whatever, but it's just my opinion about this feature. π
EDIT: I hadn't noticed before writing the post that there is a post count on the side, as you scroll. That makes it not as bad, I guess.