Based on the Thomson summer program, it does indeed appear to be the EDI-based aircraft that will operate the PMI-MME-PMI charters this summer.
Furthermore, just to make life a little bit more interesting, Jethros Fleet Listings mentioned that Astraeus B757 G-OJIB is due to be leased to Thomson for the May-October period to cover the EDI base...so presumably it will be this aircraft that we'll see in MME.