Front page of the Blue Islands website has an advert confirming that they plan to operate EXT-MAN twice daily, with the start date remaining tbc for the time being, for obvious reasons. I assume the planned based aircraft will also operate the EXT-JER flight in between. However that will still leave a fairly sizeable gap where they could fit another flight - possibly AMS/CDG/DUB, or a third MAN flight (less likely in my opinion) depending on how demand picks up?
EXT-JER is currently scheduled to restart on 18/05 (unlikely to be a set in stone date) operating 6 weekly, then 5 weekly in June, 6 weekly for July/August and finally daily for September/October (bookable until 24/10 currently).