Yes the 24 is in my near future. It depends on what happens at Photokina. I have an old 35 2.8 PC that I really like but haven't been able to use that often with the DX sensors. One very cool thing about the shift is that by shifting to the limit in portrait - you get two shots that are perfectly lapped for stitching without any nodal point distortion. Bingo! a near 24 mp and near 4X5 ratio image. A painless and elegant way to extend the format. I can't wait to see the IQ with that many of those gorgeous pixels involved with the same image.
I have the 14-24 2.8 and I'm really excited about it as well. It has been stellar on the D2X.
My L brackets stay on 90% of the time. I take them off if I don't carry a mono or tripod and plan to shoot from a bean bag or the top of my wife's purse (can be a great support in a pinch BTW).