That's what i heard ages ago, from a Jet2 employee too ! CWL was the rumoured airport along with BHX, so if there are spare aircraft to go around, count CWL in. As stated above the bucket and spade market is pretty large in Wales and will also be able to bring in passengers from the BRS catchment.
I did also hear NWI but maybe SOU instead ? Remains to be seen. Out of curiosity how many aircraft do LS now have spare for S17 including the new ones from the Boeing order ?