I too have been waiting for a 6-45RFE for a couple of years, but I will say that the new VVT Hemi with the 5-45RFE is worlds ahead of my '05 Hemi 545 in the drivability department. Today, I took a nice test drive with a '10 and in particular with the range-select, I am very satisfied. My '05 has 4.56 gears and the '10 with 3.92s in respect to RPM seemed like a theoretical '05 with 4.30 gears. It is great that you can select the gear that you want to be in for all 5 gears; that is where the Ford is lacking. Ford is 1-2-3 and D for 4-5-6.
Also, I drove an FX4 this week too and it is no wheres near as torquey or powerful as the VVT hemi. The Ford seemed very lazy and smooth, with decent torque, but the '10 Hemi felt like a rocketship. My bet is that we won't see a 6speed auto until '12 in the Dodge.