Thanks to new video leaks of the new DLC Defiant Map Pack for Halo Reach, it can be confirmed that 343 Industries is the developer, were Bungie explicitly declared that Noble Team Map Pack was their last job with Halo Franchise and also thanks to the description in the video you can see that the footage was taken from inside of 343 Industries.

A 343 Industries former developer recently discussed major red flags associated with the studio due to horrible decision-making and leadership.
“they are creatively limiting” when speaking of management. That seems to be an issue for a good chunk of MS’s studios for the last decade. It’s not as harsh as “their leadership is cancer” statement but it’s really important to nurture creativity with video games and seems like an obvious issue within MS and especially 343.
An ex speaking bad on their ex 😂
And they got rid of Bonnie and the other head at 343 so yes they done more then change their name.
Like why do we listen to people like this. If was so bad like he claimed why stay for 13 years lol.
Seems every studio associated with Halo (Bungie, 343) is just simply toxic. Coincidence or not, I don't know but it sure explains why Halo has been underwhelming since 3.

343 Industries is hiring a Generative AI Lead to integrate AI into future projects, pushing the boundaries of innovation in game development.
Go join that team and be the part of launching a massive disappointment. Now you can help lol with AI to make it even more generic, apply now!

Pure Xbox writes: "Microsoft has appointed Alan Hartman as the new Head of Xbox Game Studios. If you're not familiar with Hartman, he's been part of Forza Motorsport team at Turn 10 Studios since 2005.
Over the past couple of years he's led as Corporate Vice President of Forza and Fable, and before this was the Forza Studio Head at Turn 10."
Seems like a solid choice considering Forza and FH have been the only high quality studio, consistently for Microsoft.
What a nice reward for the latest Forza, which is probably the most mediocre of the lot so far.
Still think Rod Fergusson would have been a good shout. He's got a track record of fixing stuff and I assume he's still at Blizzard.
Not heard of this guy but I feel like anyone is better than Matt Booty
I thought Dan Greenawalt was head of Turn10 though (although I noticed he didn't do the on stage stuff at e3 this year). Is he not there anymore?
Thank you, thank you, thank you!!! This is the best news I've heard since the last piece of xbox news!
Go team xbox! Xbox will rule the world!
He's over overlooked The Forza games which have been consistently good through our the years. Hopefully he has the same eye for quality for the rest if the studios going forward.
These are new videos and a totally new story, different from my other news revealing the Defiant Map Pack gameplay.
Looks nice! 343 might be the group that saves this franchise from the hell bound collision Bungie set forth.
looks nice, cant wait to get this map pack
343 can make the maps just as long as Bungie keeps bringing us awesome new modes and playlists for free! :]
everyone loves 343 but clearly they employ people who don't remember what an awesome time it was back when we didn't know shit before we were supposed to.
These days with all the patent findings and the ratings board findings and the leaked everything, I always know what to expect from games in advance.
Doesn't anybody miss having their fucking socks blown off?!