Thunderbolt™ 2 Dock can connect to a Thunderbolt™ 3 port using an adapter from Apple:
http://www.apple.com/shop/product/MMEL2AM/A/thunderbolt-3-usb-c-to-thunderbolt-2-adapter
Using this "Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter", you could connect a 2016 MacBook Pro to Thunderbolt™ 2 Dock.
Please Note:
- Cables and adapters not sold by Apple are not supported.
- Bandwidth will be limited to the Thunderbolt™ 2 standard.
- If you use the first Thunderbolt™ Dock, bandwidth will be limited to standard Thunderbolt speeds.