A couple things that I'm aware of.
1. The days they work (especially off site) will only count as a R-day value. As well there is something about the front and back end travel day not counting as much as well. This means they'll have to work a full R-line month.

2. Something about the fly days has changed for the worse as well. I think these will be PDO.

3. The dual qual for backseaters is going away. (Can be an F/O but flex to the back.)

I know there had been a lot of double dipping where a flex would work his sim in the morning, get called for draft to do a support sim and still be home for dinner. 6 hrs reg time + 6 hrs DFT and still be home for dinner?... I think this was a common occurence. There had also been a flex that would "fail" his Sim-6 students in MIA, MCO, or MSP; they would have to retrain, and guess who could stay an extra day at DFT to do the retrain, and the company wouldn't even have to buy another plane ticket....

Positives of these changes is thoes who have sat in training dept, racked up the big W-2's, and rarely flown the line will probably be headed back to the line. There's less chances that they'll stay long at all.