Just back from the Long Beach IMS and was absolutely wowed by the new GS. From a design and technological perspective they seem to have nailed it; the motor may be water cooled but all else remains pure BMW GS. I rode my GS to the show to have a good feel for the ergos and new attributes. Like others have said, the bike appeared sleeker, less wide (probably a function of the smaller windscreen), and a little roomier in the leg/knee area. The seat height felt the same and I couldn't feel any real discernible weight diff (maybe a bit heavier?) when righting it off the side stand. The knob to change the windscreen height is a nice touch.
I'll add some pics in a bit.
My decision making has become more difficult. It all boils down to keeping what is almost perfectly refined or trying what is new and improved in certain areas.