Check out this link that was poster earlier.
http://sumtercountyfl.gov/agendas.aspx?AGID=155 select the PDF version.
In case the link does not work this is the Sumter County Commissioners meeting agenda for Feb 8, 2011.
How this is 479 pages long but in it (about page 122 to 140) about this new area. Also if you look around you will see detail plans for the assisted living center to be built on the north side of 466a right near the cart tunnel.
It also contains a lot of the lay out plans for areas south of 466a.