I thought the whole purprose of Thomson ordering the 787's was the opportunity to expand at regional bases such as BHX and BRS as well as the likes of MAN and LGW. I think it's quite understandable that the first few frames will be based at the bigger bases until any teething problems are ironed out but as more join the fleet I should imagine BHX, BRS, NCL and EMA should see a fair few 787 movements.
RE cruise destinations: I know they've operated Barbados, Aruba, Accapulco and Havana in the past but as far as I'm aware the Punta Cana and Puerto Plata flights were both weekly and part of package holiday deals which Thomson switched to EMA while La Romana, which operated fortnightly, was dropped altogether and replaced with an extra flight to Montego Bay.