There are several internal things that must happen before any production takes place. Field Testing and revisions that may or may not result, additional rounds of testing until its right. Firmware development and testing on the cameras as well as against specifications. This will likely happen for unreleased cameras as well.
Pricing of the 70-200 will be in line with the original new price of the EF 70-200 or about $2600. The 24-240 has no published specifications that I'm aware of, I expect it will be in the $1000-1500 range, but it all depends on how high of a quality of construction it gets. It conceivably could be under $1,000.
I was watching a basketball game today and saw the Canon 50-1000 in action. Its not Full Frame, its super 35, and sells for ~$70,000!
