Damn it, I had written a post for you and the browser went to another page.
I think its useful for you to get instant feedback as this is how users will react to the solution. As with everything, it looks very clean and modern, and fairly self explanatory.
I am finding myself a little overwhelmed with the statistical information (who started the thread, when, last reply, when), and I wondered if you couldn't apply the same logic as you have on the front page where if you hover over the thread the statistical information pops out. I thought it was a nice touch on the front, would be nice see it brought further down.
What do the circles, bookmark, star icons represent? I like them, but have no idea what they mean as regards the thread.
I miss some more prominent navigational breadcrumbs to go back to the category view. Whilst it is there on the top, it felt too understand compared to the page and I got a little confused how you wanted me to go back. Feels like a big icon which you can click to go back to the frontpage wouldn't go amiss.
Lastly, it feels to me like the thread view is taking up, more space than it needs to. I miss something on the right to keep it consistent with the frontpage. What about a list of the most liked/most popular threads to take up some of the space on the right side to keep it looking the same?
Those are my immediate thoughts, and if it changes after a few days' usage, I will update my reply accordingly. :)