I suppose I should know more about this since I am a 135 lifer, but I confess ignorance on all this. I thought the first new tanker was supposed to be the smaller one. Obviously this was not the case. Did the goals of the program change or did I have bad info from the start?

Since less than 200 KC-45 are scheduled, it seems as if there will still need to be another new airplane to update the fleet--smaller than the KC-45 and built in greater numbers. What might this plane be:
A 707 redux built with 21st century technology/materials?
A 737-800/900 with body tanks and an AR receptacle?
Once more with the 767?
Something completely different?

I guess probably the last. Congress and the USAF seem to want to fund the tankers about every 25-30 years. Given that record I'm sure that it'll be a long time before they field something new.