I thought Thomson were considering a few more routes from Cardiff with Salzburg very likely and a couple of Italian & French routes strong possibilities?
However, the extra rotations from the 763 could be freeing up time for the 752 / 733 to allow JER and BCN out of the current based aircraft? I'm pretty sure that the 733s they have on order are to replace the old 735s and not additional capacity.
Either that or they're waiting to see what Baby are planning with their 4th 733.
MB