If you are a 600/65 owner and happy with the PalmOS, wait
If you are looking to go Windows Mobile and not happy with the current offerings, but the SPrint 6700 looks good and is near Treo in size, then wait for the update. If you are not on VZW, you may have to wait until late Spring/early Summer as liek Sprint with the previous PalmOS Treos, VZW has a few months of lead time with the WM Treo.