The two B752s that are shown as new acquisitions for JET2 are shown to have registrations G-LSAK and G-LSAC that came from ATA Airlines and Ryan International respectively. G-LSAK is shown to be stored at Lasham (QLA) at this moment.
Also, the same source maintains that JET2 have acquired two B763s, as follows:
25132 B767-38E(ER) PR-VAF Stored at Goodyear (GYR) Fom: GOL Trans. Aéreos
27427 B767-328(ER) PR-VAN Stored at Tucson (TUS) From: VRG Linhas Aéreas
Curiously the information on the B763s was updated very recently but as you say all indications from JET2 are that the deal was cancelled.