Here's to hoping the much-awaited Perfect Susano'o / Sage Kurama combination delivers! I wonder if the whole thing will be imbued with Naruto's Sage Chakra, or if Juugo will still be in the mix. Personally, I wish Kishi would just say that Sasuke's Susano'o re-obtained Juugo's power, and Sasuke can permanently draw on it using Susano'o and his own chakra (basically a Sage Mode Mangekyou).
It'd be cool if merging with Naruto's chakra did something to Sasuke (if not awakening the Rinnegan, then perhaps allowing something really hazed like a flawless Izanagi that doesn't cause blindness). Something to really put Obito in his place.