Mainly bug fixing and usability improvements. I'll also be fixing our memcached issues so the site will possibly have a 2-3x increase in response times. As for design 4.1 is going to be a solid release so I plan to contract a vbulletin skinner to provide us with a couple more skins.. possibly a middle grey and a dark skin that members can switch between. Gallery will have some design improvements such as seeing an image posters additional images within their posted image pages and ability to select different toned backgrounds for gallery uploads.