No. For example, Verizon had test deployments of their LTE deployed 12 months before it rolled out to the public.
http://www.ciozone.com/index.php/Mo...on-Conducting-LTE-Testing-in-Five-Cities.html
They did technical testing in Boston and Seattle. Then deployed for testing in 5 cities. Then almost 12 months later rolled out to a public launch.
Same process with Apple. They will test in a lab. Then send some prototype with out into the field to test in the "real world" in a couple of cities. They could be months away from locking down their LTE designs.
Is Verizon going to follow ATT and put one of their strongest LTE towers on the cell that covers Apple HQ ? Yeah. But as Attennagate showed, Apple needs to go out in the real world to see what happens in locations where most people are going to use the phone. They need to be in locations where the phone is going to try to flip-flop between LTE and 3G and see what happens. Likewise go somewhere that has a mix of phones of differen brands and see what happens there.
Given tweaking the antennas can impact the physical form of the phone they need to get out into the field
before the physical design is completely locked down. Tests and bug fixing in Aug-Nov would allow for a phone next May-July to roll out. (there are lots of other factors that need to be rolled up into a new phone including beta testing of the new OS with developers and new app development. )