I just bought mine... Again???
I figure I can sell my current one for what I paid for this one in a few weeks when rebates end... I bought the new one with my amex so my warranty is "refreshed" from nothing on my current to now 2-years. Its like updating your car model year without paying anything! I got mine for the $1974, but I also get points so technically I get like $20 back on my Amex as well. So for $1950 that is awesome.
Look forward to my second 70-200 II... I am going to compare them optically and see if I notice anything at all different.