GJZHE:
According to FR24, GJZHE flew over 2 hours on tests from and to Norwich on 20 April and then was flown from Norwich to Bournemouth on 21 April. It would appear that it is being prepared to enter service fairly soon.
GJZHG and GJZHH:
The only recorded information to be found at present on the above airframes is that they continue to be stored at Budapest. With the summer 2016 season about to start and the recent leasing of a B738 from Primera Air, maybe the arrangement to purchase GJZHG and GJZHH has fallen through. Just my thoughts, no inside information.... GJZHG and GJZHH are owned by an Irish leasing company and were operated by Transaero, the bankrupt Russian airline that has ceased operations during 2 and a half years. Previously they were operated by Air Europa.