ssh and HPN

So was there ever a result as to whether HPN still plays a useful role 
in the current openSSH?
I haven't seen any note in the openssh docs about adding bigger window 
support and that is a definite requirement when you are on the end of 
a 500mSec RTT like I am,
but the last time we discussed it, there was talk of some changes in 
openssh making the HPN changes redundant.
If anyone has more information about that claim, I'd like some more 
definite information.