According to multiple industry sources, the Senate Commerce Committee has been trying to pencil in an FCC oversight hearing for June 18, though there might be a scheduling conflict on the FCC's end.
The witness list would include at least FCC Chairman Tom Wheeler, and perhaps a Republican (likely senior Republican Ajit Pai if only one), or even all five commissioners.
Wheeler was the lone witness at a House Communications Subcommittee oversight hearing May 20, where network neutrality was a big topic of discussion. It is likely to be the same in the Senate Commerce Committee if that penciled-in meeting gets written in pen.
A committee spokesperson was unavailable for comment at press time.