Same. They originally had Jan 7th as order, but I keep getting updates reducing the window, now scheduled for Dec 29th. Going to be my 'main' system now, while I've had several Macbooks/iPads over the years I've always used a PC primarily, so this is a first.
Mine still says January the 5th, so I hope they bring it forward.
It would seem that both Thunderbolt 4 ports have access to full bandwidth and doesn't share a controller, which is nice. I know it is basically a fluff piece from OWC to advertise their new Thunderbolt Hub.
But it means we can get full PCIe v3 x4 lanes from external NVMe drives.