Two things:
1) I actually really like the new theme. It's slick, user friendly, and I appreciate that the "view new posts" link is always visible no matter where I am, so I can always pop back to "browse what's newly posted" mode with a single click.
2) The forum is definitely more than a little odd on a mobile device. The view jumps up to the top of the page periodically, whether or not you click anything, and the user icons are squished. Also, the text is shoved into a very narrow band.
Personally, if I had to chose between making the mobile version more user-friendly and keeping the normal version the way it is, I'd chose the latter, but it's worth noting that the mobile version is kind of wonky.
Also, I miss having a "like" button. And silly titles as our post count increases. Any chance of getting those back?