I am in the HELL NO! camp for a like button.... ultimately a like button is of no use unless you need to order things by number of likes, or else hide things that get disliked, but both of those would ruin the flow of a thread.
I know you are probably not going to agree, but please give back the ability to colour text in the RTE.
I agree on cutting out some of the seperate forums, the tag feature sounds sensible (as long as you make a set list for tags)
I think what Millenium was asking earlier was to simply block videos from walls... I would say a wall only needs to have text and hyperlink options, I would guess some of the heavy wall posters would disagree though. (are the current wall post rules just a copy of the quick reply box?)
I guess neither of these will be an issue now, but badges and now playing sections have been taking up ridiculous amounts of vertical forum space for a while now, add to that the long avatar issue and it's rare I can even fit a full 2 posts on my screen at once. Obviously badges and game collections are going so that will save space, but please don't replace it with anything else... Personally I would like to see it possible to fit 3 posts on my screen at once (ie within 700px... assuming the posts themselves are short enough of course).
Oh and this is not restricted to just the forums, but please make it possible to go to the important areas of the site from a site-wide menu. (I know the site is in transition or whatever, but currently going to the main homepage only has a single top-level link to the forums)