Personally my only issue with the new changes is the fact that like you said, there's still no rank decay which is a NEED haha!
Also the fact that your rating carries over, to me that just doesn't seem fair to anyone that isn't top 100 or close to it. if you make diamond you start in gold, plat start in silver. etc. I understand what they are trying to do, with help better match making with players of your "skill level" maybe it's just me and it isn't as bad as it sounds to me haha! guess we will see XD.