The thing that seems most peculiar to me is that there brightness seems to persist as the asteroid rotates in a way that doesn't look quite like a simple reflection from a flat bright spot. (OK, it's a video from a nutty UFO source, but I think its a genuine close up.)
And: here is one of the "possible" explanations as listed on Cnet:
6. Aliens' solar concentrators. In a 2008 TED talk, physicist and futurist Freeman Dyson suggested that the dwarf planets of the outer solar system, near Pluto and the Kuiper Belt, would be a good place to look for life. Dyson thought that although finding it might be unlikely, it might not be that hard to search if we simply looked for the reflection of the mirrors and lenses that any life forms would surely need to concentrate sunlight to survive on places like Europa and beyond. It sounds far out, but could it be that we've just found some ancient, abandoned solar concentrators even closer to home than Dyson imagined?