What people don't realize is that waiting for the 2017 it's possible Apple does offer 32 ram and yeah they might increase the battery size but it just might end up being a wash in the same battery times as the 2016 MBP. If your thinking Apple is going to claim 12 to 14 hrs on battery for 2017 your dreaming.
It's possible they'll offer better battery life for the 16 GB versions, leaving them with LPDDR3, but what you describe for the 32 seems likely. The most they can add to the battery is just under 24 watt-hours. Using DDR4 to achieve 32 GB could easily eat that up pretty quickly, so that even with the larger battery, battery life might actually be significantly reduced.