Its expansion based on something. No one knows yet. Could be additional aircraft into TUIA or could be 3rd party. Internal comms suggests this decision is still to be made, although that could just be HR malarkey as company/union are locking horns at the moment.
Recruitment has opened earlier than normal so that maybe a hint that the company are gearing towards a busy training year and thus having to start earlier than normal if the expansion comes in-house.