From Halopedia, the Halo wiki
The Halo Bulletin was a weekly writeup posted by 343 Industries at Halo Waypoint, offering the fans a look at the Halo universe. As Bungie had moved on from Halo franchise, the Halo Bulletin replaced the Bungie Weekly Update as a weekly source of official Halo information.
The first Halo Bulletin was written by Frank O'Connor and posted on June 7, 2011 in the aftermath of the announcements of 343 Industries' new projects, Halo: Anniversary and Halo 4 at E3 2011. Subsequent bulletins were written by then Waypoint's Community Manager Jessica "bs angel" Shea. On June 6, 2013 Andy "Bravo" Dudynsky took over the job of writing the Halo Bulletin every week.
The last Halo Bulletin was published on November 6, 2014. It was discontinued and replaced by The Bulletin, a video feature of the Halo Channel, whose first episode aired on November 14, 2014. The Halo Community Update, which replaced The Bulletin, follows a similar style to the original Halo Bulletin.