Update:
Since originally posting this answer, recent events in relation to the emails the FBI was reviewing in respect to an investigation into Mr. Weiner have concluded. The FBI reported that no new relevant emails were found, and their previous conclusion still stands.
In-fact, NBC reports that nearly all of those emails were actually duplicates.
A senior law enforcement official confirmed to NBC News that nearly all of the thousands of newly examined emails on Weiner's laptop were duplicates of emails already seen by the team investigating Clinton's server. [...]
There were unseen emails, the official said, but they were unrelated to government business.
The new letter indicates that the FBI's review is completed. Neither Comey nor the FBI are expected to release any other statements.