Hey chris,
Thanks for letting us know about these class changes coming with 7.1.1.
Many people already commented about the previous changes so I'll just talk about the Lightning Sorcerer ones for now.
We all agree that hardcasting Halted Offensive was a bad thing gameplay wise. It turned the class into a turret and seriously affected mobility. So increasing cast time is most welcome, thank for you for that, it will definitely solve that issue.
However you have to realize that hardcasting HO was what made the spec performing alright on dummy ONLY (and it's not broken or anything, just alright. Source: it's currently 10th out of 16 spec on average on Star Parse).
The longer cast time will stop players from hardcasting it and will already result in a serious DPS nerf.
But Lightning is NOT overperforming at all on proper bosses, its damage is below average most of the time, and it performs even worse when adds join a fight. Removing hardcasted HO will make the spec do even less damage in operation.
The other nerfs seem more than unnecessary and will result in an even bigger dps loss for a class that was already sturggling to stay on par with other specs. Reducing Halted Offensive damage by 15% will result in a 5% dps loss by itself which is completely overkilll combined with the 4 other nerfs mentioned. If anything, preventing players from hardcasting HO (which is a good thing) should have implied a BUFF on a few other passives to not become another dead weight for your group.
But at the very least, just increase HO cast time and don't touch the rest if you want to keep a viable class.
Thanks