I feel like half the people here are only complaining just to complain. There's nothing fundamentally wrong with the design, imo. The only valid issues I've seen so far is with the large amount of white space and how narrow the forums are.
With the former, white space is just plain ugly and that can unanimously be agreed upon. However, proper spacing is still important (which the old design lacks and causes everything to be too bunched up).
With the latter, that's mostly just a matter of opinion. There's nothing wrong with a narrow design in principle, but the thing that bothers me most with it is when posts in a thread get even more narrow after the OP. That doesn't really make much of any sense to me as a design aspect, as there are much better ways of distinguishing an OP.
As far as pagination goes, there's nothing wrong with it. If people know what page to look for, then they should also know the approximate post number to look for. Post # = Page # x Posts-per-Page.
However, I will say that having the current post number be clickable doesn't make much sense. In fact, it might be better to make it so you can use that "current post" number space to type in the number for the search, instead of having to click the search icon to type it in. One less icon to worry about then, and better convenience.
Aside from those things, I find the design itself to be beautiful overall, and I'm sure it will only continue to improve. Functionality will be added later and it's not even worth commenting on yet until it's actually implemented.
And I still don't get why people are complaining over the test domain name. Who even gives a jizz about a temporary name.