Seat configuration VS027 in May

"Manage your booking" currently gives a B747 Config 1 seating plan for our VS027 LGW to MCO flight on 30th May. Does that mean the B747 is the most likely aircraft rather than definate? Or could we still end up on an A330? If it turned out to be the latter what would happened to our family of three provisionally in the ABC (window middle aisle) seats in economy?

VS plans its fleet carefully so if it is showing a 747 operating the flight then that is it's firm intention to run the 747.

VS only have two A330s at present and given that the number of pax on a 747 and the 330 is totally different (and there is no UC on the 330 yet) it is unlikely to swap one for the other unless it really has to.

If they did swap then they would simply reallocate you to different seats which you could then change in 'manage my bookings'