Positional ranks

As far i can say about the new positional ranks ain't the best deal but you can end quite closer to your previous rank.
On main got d5 and i was d4.
On two new accounts it wasn't so fun.
First one i won 5/5 = silver 4.
Second one i won 10/10 = silver 2.

So as far as i can say you won't go "higher" with a fresh account but you do win 60-80 lp / win until your MMR gets normalized.