VA are having a new fleet of Airbus for flights to MCO.
From April/May 2011....

LGW from May 2011 the VS027/028 is an A330 on Mon, Tue, Thu & Fri.
Wed, Sat & Sun is back to the 747.
The VS015/016 and the VS049/050 will be a 747 regardless.

Man from April VS75/76 will be an A330, the VS73/74 (if flying) will still be the 747.

GLA the VS71 shall be an A330 from May.