We have done a couple dozen placements for season 6 and this is what i've noticed....
In the first 2 weeks account's were placing much lower than normal, for example an Previously gold 5 account going 9-1 would place silver 4 where as this should of gotten at least high silver.
Then recently things seem to be back to normal, previous unranked accounts getting gold 5 from 8-2 or better, Plat 5 accounts placing Gold 2 - Plat 5, etc.
Anyways if you did happen to do your placements in the very early release of season 6 and placed abnormally low you most likely will be getting high 20s or low 30s per win to help you get back to your previous rank.
Cyas on the rift!