[seanp2k2]

http://plugable.com/thunderbolt-3/ also has some good info. Apparently there are TB3 adapters which don't work with tbMBPs.

All I want is a single TB3 plug that powers my laptop and hooks up 2x4k displays at 60hz. A USB port or 3 would also be nice. Apparently this does not (can not?) exist.

From the Pluggable site: "Connect two uncompressed 4K 60Hz (4096 x 2160) displays (one via a DisplayPort++ port and the other via the 2nd USB-C port)"

Why can't I just have two real DP++ ports on the dock?

They do make one, but it's windows-only: Thunderbolt 3 DisplayPort Dual-Display Adapter for Windows (Plugable TBT3-DP2X)

Is there something about the new MBPs which prevents them from sending 2 HDMI or DP signals out over a single TB3 port? It seems like a huge step backward to now require a network of dongles, adapters, docks, and special cables just to replicate ports which other normal laptops have.