website vflyer is reporting that an airbus a333 will be operating the lgw/man/gla/mco route on certain days of the week from april 2011.
First flight will be MAN-MCO on Saturday 2nd April (VS075)
There's some debate as to whether there'll be an upper class at all on these flights but the theory is that there'll be less UC/PE and more economy in % terms.
The airbusses are smaller than the 747 so may be more rightsized for the projected requirements during that period.
They're also supposed to have in flight wifi internet access and a significantly uprated entertainment system