Yes, next round of cancelations will be within the 15 months re-booking window for the upcoming itinerary release.
I would like to think they'll start cruising again at the end of July but the fact that they went through so much trouble to send all the CM's to their home countries makes me think not. Why would you sail your ships around the world to repatriate crew if you were just going to recall them in a couple of weeks? Also, even if they were able to recall all the staff from the four corners of the globe, they would have to quarantine them all for a few weeks prior to exposing them to the guests because you have no idea where they've been or who they've come into contact with. So up and running by July 28th doesn't look reasonable to me based on how they're conducting their business right now.