The latest update shows there is a lot of potential for Halo 5’s future, and Halo’s future in general.
I would like to make a few recommendations for the future updates. I know 343 is drowning in requests already, but hey, some people are starting to like you more for listening. Take it as a compliment. 
Warzone Firefight :
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I love this mode. It’s awesome. Only thing I regret not having is a few rounds where we can fight prometheans that use other UNSC vehicles. I know they use Warthogs (never Gauss ones though) and Mantises on occasions. But it would be great to have rounds where we fight soldiers who use the different variants of Gungooses, Wasps, and even Tanks. Having a few rounds with enemy Gungooses would also help working on the commendation for Gungoose destruction which is frankly, very long and tedious to accomplish (simply due to the vehicle unpopularity and weaknesses). Overall, this recommendation is to help open up the Warzone Firefight spectrum of potential enemies, while including ALL vehicles as possible AI enemies. Feel free to use more variants of vehicles for enemies (how about a destroy 2 Phaeton Helios enemy round).
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Apart from more UNSC vehicle rounds, I suggest adding more round diversity (not that it’s currently bad, but more round diversity is always fun). I know you already added different rounds with the new Grunt Goblin variants, so keep going! I have also noticed a new round (apparently) on Raid on Apex 7, where 4 soldiers are split around the map. Good on you! Perhaps add a defend the core round.
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Add chaingun Gungooses (the ones you introduced in Halo 2 Anniversary). I’m sure they’d be loved, and they’d give a chance to people to complete the commendation more easily.
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I know this might be more difficult than it sounds, but consider modifying the loadout REQ UI. You must know already, but scrolling through loadout weapons can be tedious at times. Instead of making a linear list, how about you make a square list? It would reduce scrolling to the right, and organize the loadout weapons in a more comprehensible way. Here’s how it would be : on the first horizontal line, you’d have all the scope variants. On each vertical line, you’d have the variants of each scope variant.
Arena :
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Social playlists, especially BTB, need a map where there is a Phaeton. Now don’t get me wrong, I understand Phaeton commendation is meant to take time to get, since it’s scarce and you can get Lasered/Rocketed pretty easily at times. But having the chance to use the Phaeton outside of Warzone would be great and fun! Of course, give the counters to the Phaeton on the same map too, in order to not make it OP.
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Despite you (343) making an alternate Blood Gulch, which is alright, it would be very appreciated if you could include a fan made (or your own) remake of the original Blood Gulch/Coagulation. This map oozes with nostalgia, and adding it to the BTB playlist would bring back days of glory. Fans would love it!
Other recommendations :
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I know you already did that, but combine a future update with free-to-play week-ends for Halo. Combining the two can help bring new players to the game, and refresh the playerbase with newbies. A healthy stream of newbies is good for any game.
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Perhaps an occasional XP week-end would bring some occasional buzz to the game. This method must not be abused of course.
That’s it!
I don’t always write such long posts, but when I do (and other fans do), it’s often because of their hope and love for a game.
Thanks again 343. I’ll be looking forward to what you have in store next!