Antigua Flight Changes - Help please

Interesting/worrying... we're booked on the VS33/VS34 to ANU on 24th Oct through 1st Nov. The page listed on the sticky thread about schedule changes show we are likely to move to the VS35/VS36 (via BGI) I do not believe that these flights normally operate on the same days.
Now neither FC, nor Virgin Hols seem to know anything about it, yet I am concerned that quite apart from making the flights longer by a couple of hours (sorry to say that I will have pre-school bundles of joy in tow), these flights were already very busy due to half term week and am afraid of getting bumped.
If anyone can provide any inside info on what is happening with these flights, and what happens when they have too few seats for pax in these cicumstances I would be very grateful.
Thanks in advance.
Now neither FC, nor Virgin Hols seem to know anything about it, yet I am concerned that quite apart from making the flights longer by a couple of hours (sorry to say that I will have pre-school bundles of joy in tow), these flights were already very busy due to half term week and am afraid of getting bumped.
If anyone can provide any inside info on what is happening with these flights, and what happens when they have too few seats for pax in these cicumstances I would be very grateful.
Thanks in advance.