Thomson and First Choice drive on with exclusive product agenda - www.travelweekly.co.uk
The above link appears to suggest that TOM long haul is not currently on the agenda for BRS. In fact, Severnside and the greater South West England/South Wales still don't feature at all in the plans as set out by the TUI UK/Ireland MD in the linked article.
I suppose there might be an outside chance that the company is waiting to see if the next government devolves long haul APD to Wales before committing itself to either BRS or CWL.