+1 on the tripod collar redesign - structurally, the size of the X1D with something like the 50-110 hanging off the front made me worry/laugh/wtf. A proper adapter would include a rotating lens foot, and would accommodate the HTS. Something where the adapter has an Arca clamp as the base, and you'd use a double-sided Arca plate that would allow for attaching to the base of the camera as well. And maybe a finger plate against the body so I can hold/carry against that rather than the body?
We're coming up on 2 years of the X platform, and while they've increased the lens count to 5 primes, the lack of a zoom means Hass really needs to leverage their existing glass.