Oh yeah, it has yet to leave Boeing's visual art department in anything more than a conceptual drawing.
Relax, in case of emergency US Air Force could rent about 14 tanker from http://www.airtanker.co.uk/. That’s about one-fourth of KC-10 capacity. Also another 5 are already available from Australia. Saudi Arabia or UAE may also supply some tanker aid.
What’s the problem with not having the latest tanker? The US tanker being late? Boeing said the program is on track. Last time I heard that the program was called 787. The F-35 is also late. So what?