When Nintendo announced the new Switch OLED model, a new updated dock was revealed as being included as well and features a wired LAN port and rounded corners and will be compatible with the previous Switch models as well.
If you just would like to pick up the new dock, you are in luck as Nintendo confirmed it plans to sell the dock through its online store, but retailers will not be offering the dock.
“The white dock and black dock will be sold separately (no HDMI cable, no AC adaptor, not in a package) on the Nintendo online store. It will not be sold at retail.”
The Switch OLED model launches on October 8 and presumably, the new dock will be available then as well.