Wait for the aftermarket to catch up. Based on problems people are having with getting certain functions to work on the 6.5... and the fact that a 6.5" display nowadays is really laughably inadequate and outdated... you might as well just use your smartphone and bluetooth pairing to fill your nav and music streaming needs until an aftermarket option become available (if Renegade specific install kits aren't already out yet).
Frankly, if you go down this path you might not even find the need for a larger integrated screen. I bought my 2007 Element in 2010 and have been using a smartphone for nav and music since with a Belkin product plugged into the factory Aux-In to add bluetooth. Have had the itch to get an aftermarket system in the past but soon realized what I've done works just fine.
Plus, much easier to update a nav app on the phone than to update/upgrade map data in a head unit. And when I leave the car, I always have the phone with me; no need to worry about crackheads breaking into my car to get at a fancy head unit.