Admittedly, for my needs the 15" models are not great. Writing and some computer programming/big data. I prefer longer battery life and a lighter/smaller 15" unit. The new unit claims to have about 2 hours more battery life than the 2015 model (see tables of battery life near end) [1]. Also important to me is nearby Apple stores to get my Mac problems looked into if I need it. Could somebody please be specific as to…
The new model is not improving CPU performance ( https://browser.primatelabs.com/mac-benchmarks ). Also, losing the escape key is painful, and I still frequently use devices that don't have USB-C connectors. I did an all-around comparison and chose to buy last year's model instead. I can't think of a previous occasion when a new Apple product was worse for me than the one that it replaces.
The 2016 model consumes much less energy for the same performance (see link in my post above) and the SSD speed (esp. in >= 512 GB models) is much faster. It also has built-in hardware X.265 decode (IIRC) so watching those movies will require less energy than the 2015 as well.