I'd been waiting along with others, for what certainly seemed like ages, with my 2011 CTO 15" MBP.
After the sticker shock wore off on the new models, I sat down and looked at what I needed:
1. quad core for running VMs, Dev environments, ...
2. 16GB RAM minimum, 32GB preferred
3. 1TB storage minimum as I was coming from 2TB on my modified 2011.
4. Ability to plug into various projectors and big-screen LCDs/TVs for meetings w/minimum of hassles
5. Faster IO beneficial for VMs
6. Ability to plug into at least 2x external displays concurrently
1, 3, 5 and 6 were met by both the 2016 AND the new model, with the 2016 marginally on top overall (nice SSD speed boost, though).
I like touchID and TB3/USB-C.
Except when presenting or in meetings, I'm 90% plugged into external displays, keyboard and mouse, so I'm completely indifferent on the touchbar, and would gladly remove it if an option for the 2016 15". While I have no doubt the display on the newer model is nicer, again, I'm plugged into external displays 90% of the time, so it's a nicety but overall not meaningful, to me.
The lack of more RAM combined with needing a dongle when I'm called into a last minute meeting for something, along with only marginal benefits to me in my usage for the 2016 model benefits, made it a no-brainer.
Although I wanted to pick up the new model, I scored a solid deal on a used 2015, 16GB RAM, 1TB SSD 15" for less than half the price. It'll work just fine until sometime in 2017 or 2018 if/when Apple refreshes and/or changes up their lineup into something I have to have, at which point I'll go new CTO/near or maxed system.
Interestingly, even moving from my seriously dated 2011 CTO to the 2015, it isn't a huge jump in performance - certainly better I/O throughput and VMs running a bit more smoothly, along with generally lower fan usage, but looking at the benchmarks for the 2015s vs the 2016s, I doubt many would notice much obvious improvement unless doing long video transforms or large compiled projects locally.
Short version - 2015 for me, will revisit in 2017 or 2018 and see what's on offer from Apple at that time.