I heard a rumour from a 320 trainer they're expecting "about 50" DEP onto the 777 as if they "backfill all the 320 FOs who should leave this year, the CAA could ground us as the experience levels (on the 320) would be too low". I'd be surprised but you never know.
Fortunately there aren't any 320 FOs in BALPA any more so that's one less thing for them to worry about!