Well personally I think that the 100 x 100pixels is just fine for avatars. Maybe 115 x 115 to a 125 x 125 MIGHT be possible...depends, not my call to make so. However I would rather favor a slightly larger file size limit myself so that animated avys could be used with more ease.
As for "ranged privileges" I'd assume you mean something like larger sig sizes or larger PM boxes for Elite+ members? Depending on what you're looking for and depending on if Cowboy Bebop and Hellsing are willing to make any new changes and/or additions than who knows what will happen.
...but honestly I wouldnt keep my hopes up. ^^;