Although I'm guessing form the title of your post you may have already done this. If enough people in your local area show interest that it is commercially viable to expand into your area then VM will, but are unlikely to announce it publicly until the work starts as expansion plans are probably classed as commercially sensitive information.
All you can do is encourage your neighbours to register an interest and cross your fingers.
Disclaimer - I don't work for Virgin Media. I'm just another VM user trying to help out. My setup: V6 TV box, Vivid 200 Optical fibre with Hub 3 in modem mode connected to a Netgear R7000 router. Telewest/VM user since 2001.