NeoGAF forum member ekim might have uncovered evidence that Microsoft is preparing an Xbox One hardware refresh that'll be released before around June.
The Federal Communications Commission (FCC) is the American agency responsible for regulating radio, television, wire, satellite, and cable communications in all 50 states. By law, any device that includes a wireless communication chip must be submitted to the FCC to confirm that its radiation levels and bandwidth usage are within approved ranges and that it doesn't cause electromagnetic interference to its surroundings.
The FCC only reviews the wireless chipset, but the filing should include the full specs of the host device. This Information can be kept secret until the device is released to consumers.
Microsoft was careful not to reveal any info about the host device for its Dual-band Wireless Accessory Radio with FCC IDs C3K1682 and C3K1683, but Ekim somehow noticed that the still-classified user manual file name for the later had the same FCC ID as the original Xbox One.
This might be a very unlikely coincidence, but the more reasonable explanation is that the new wireless chip is part of an Xbox One hardware refresh that uses the same user manual as the older model. Interestingly enough, the FCC filing was updated shortly after to remove the Xbox One FCC ID from the user manual's file name.
The confidentiality protection for C3K1683 is set to expire on June 25th, less than 10 days after E3 when Microsoft is most likely to break the news. Model C3K1683 uses the same wireless chipset, but its details will remain under wraps until July 29th.
VIA: NeoGAF.