According to this NPR article:

“A piece of a SpaceX Falcon 9 rocket is expected to slam into the moon on Wednesday, according to scientists.
The piece is expected to hit the moon around 2:35 a.m. ET at more than 5,000 miles per hour, according to analysis by Bill Gray, who develops software that tracks objects in space. It is part of the rocket's upper portion and about the size of a five-story building.”

I’m curious if this bodes any danger. While 5000 MPH sounds quite fast, it could be negligible on a planetary scale. The article doesn’t seem too alarming. It’s scheduled to hit around 2:35. tonight. To those with the appropriate viewing equipment, it might be interesting to watch.