Hi gmhahn,
According to my co-teacher, people who have contracts that end on August 31st will be OK. If they don't re-hire any of the NTs whose contracts expire on the 31st then no schools would have teachers on Sept 1st. GEPIK wants all of the contract start dates to line up. So, if they didn't re-hire the teachers who finish on the 31st, they wouldn't be hiring any NTs until March 1st, which makes no sense. They can't re-hire anyone to start on a day before September 1st, that's all.
If someone's contract finishes on June 22nd and their school wants to keep them then they will have to re-sign with the start date being Sept 1st. So, that person will be out of a job for a little while. It's really silly and many schools will loose some good teachers because of that. The one's who will miss out the most will be the kids..