World of Tweed, are you guessing? How do you know that exactly if you don't work for Virgin?
I'd be surprised if a delay in an order for 15 787's gets 10 free Airbus A330's out of Boeing! They're not that benevolent are they?
Since Virgin recently got rid of aircraft (and crews) due to EXCESS capacity, I don't think any GAPS in capacity have materialised yet. In any case, the A330s are unlikely to go when the 787's arrive (if they do arrive!) and fill a very different role to the 787. The Virgin A330's are the short(er) range version and will not do a very good job of subbing for a ULR capable 787! Different market.