This 2 January 2018 video from the USA says about itself:
NASA says it will release new images Wednesday of Ultima Thule, the most distant object ever explored by humans, taken by the New Horizons spacecraft. Scientists believe the icy world, more than a billion miles beyond Pluto, will reveal clues about the origins of the solar system. Mark Strassmann reports.
New Horizons shows Ultima Thule looks like a snowman, or maybe BB-8. The Kuiper Belt object is probably two rocks stuck together. By Lisa Grossman, 5:42pm, January 2, 2019.
See also here.
The latest picture of Ultima Thule reveals a remarkably smooth face. The object’s lack of craters suggests the Kuiper Belt isn’t filled with lots of space hazards. By Lisa Grossman, 11:17am, January 29, 2019.