The package would include 2001's Halo: Combat Evolved, 2004's Halo 2, 2007's Halo 3 and 2012's Halo 4, and would leave out spinoffs such as 2009's Halo 3: ODST and 2010's Halo: Reach, according to Engadget's sources. No developer is known at this point. Saber Interactive and Certain Affinity collaborated on 2011's Halo: Combat Evolved Anniversary for the Xbox 360; the original Halo is the only one that has already received a high-definition remaster so far.
This morning, current Halo developer 343 Industries announced that the next full entry in the franchise, Halo 5: Guardians, is set for release in fall 2015 on Xbox One. In the announcement, 343 Industries general manager Bonnie Ross said that the franchise's journey on Xbox One "definitely begins in 2014 with a giant leap, rather than one small step."
The plan for remasters of all four games was leaked months ago by NeoGAF user "ntkrnl." We've reached out to Microsoft for comment, and will update this article with any information we receive.
Update: A Microsoft representative declined comment on the report to Polygon.