I don't think there will be many more classes starting this year. There might be one or maybe two small ones, but right now there is nothing on the classroom schedule for basic indoc through the end of the year, other than the class that is in there right now.
Things can obviously change, but by my count there are about 10 new hires who would need indoc by the end of the year, according to the new hire slots on the various training letters. 5 for ANC MD-11, 2 for EUR 757 and 3 for HKG A-300.
The slots are fairly spread out so I don't know if they would do one BI class or split them up, my guess would be one class of 10 and then have them wait for their training slot.