I’ve just now started seeing things like Halo: Retribution, Halo: Warfleet, and Halo: Legacy of Onyx popping up. What info is known about these upcoming titles? I didn’t find much on the web.
AH Legacy of Onyx you say… you have my attention
My take is halo retribution may be written as a continuation from Halo 5 (Cortana’s perspective)? And probably Team Katana can come in during Legacy of Onyx? we still dont know what happened to them 
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> I’ve just now started seeing things like Halo: Retribution, Halo: Warfleet, and Halo: Legacy of Onyx popping up. What info is known about these upcoming titles? I didn’t find much on the web.
Warfleet will feature schematics and technical information about a variety of ships, stations, and colonies in Halo. It’ll also feature cross-sections drawn by Hans Jenssen who is well known and famous for the Star Wars cross-sections he’s drawn.
Halo: Legacy of Onyx seems it will be a continuation of the Halo: Fractures story “Lessons Learned”.
Nothing is currently known about Halo: Retribution. My guess is that it’s also a continuation of the Halo: Fractures story “A Necessary Truth”, which very much deserved a continuation.
Bring on Legacy of Onyx and Warfleet. They’re so far away though