Since Oct 1st was their launch date, you can expect to see them beginning to filter into Dealers hands within 90 days of that date or around the end of the December. If EB is caught up on orders, maybe sooner, but I would expect them in about 4-6 weeks.
The Bobtail version in the Executive Series is called the Executive Carry (basically the same features and options as the Kobra Carry except it will feature serrations on the slide and 25LPI Checkering on the frontstrap and mainspring housing instead of the Snakeskin treatment).
I've handled the Executive models and thought the 25lpi checkering to offer a better hold than the snakeskin. I compared them side by side and chose the executive over the cobra. This is of course only opinion. When I'm ready for a 1911 it WILL be an Ed Brown though and that is fact.