From our upstream hosting provider:
Start: 2014-01-23 00:00 EST (UTC-5)
End: 2014-01-23 03:00 EST (UTC-5)
During the above maintenance window, Level3 will be performing what they call a scheduled emergency maintenance to upgrade equipment to prevent an extended loss of service.
We are expecting minimal impact but there can be some short periods of as inbound routes converge for the changing of providers.