The aggro switches aren't new, but 2.6 did exacerbate the issue and it seems like Raptus' knockback/knock up are pushing people further.
It's not "2.6". We did him with no problems last week (2.6 dropped on Tuesday 4th Feb). We also had not seen Raptus change target to someone during the Force Execution cast, and that caused at least 2 wipes.
About the push, this week my co-tank got knocked right out of the circle from the square in the middle of the area at least 3 times, and I only avoided such a fate one time because I hit one of the archways to the Trials.