More to come from RTX.

UPDATE: The Halo Bulletin 7.18.12

Thanks to a Q&A some of the Forge details were released.

It was mentioned in the Forge demo that there will be multiple Forge environments. Does this mean multiple Forge Worlds with a different setting and theme for each? If so, can we assume different styles of parts for each? - BenPwnsAtGamez

There will be some aesthetic variety we’ll talk about later – as well as the obvious inclusion of aesthetics and Forgeable objects from specific maps (Forerunner vs. UNSC objects, depending on the content of the environment), but most objects will be UNSC themed – although there’s more to come on that front later.
 

Will any 343-created Forge maps be released into matchmaking alongside the 10 regular maps? - Link1201

We won’t be putting Forge creations in the “main” matchmaking areas initially, at least. Certainly Forged variants may go in (rules, the odd object placement) eventually, but we’re still discussing how to promote and enable Forge creations in a way that maintains a separation of that kind of content from the main mix.
 

How big are the multiple Forge environments compared to Forge World? - bellz1996

The environments will be large enough to accommodate just about any design you can think of, from a Lockout remake to a sprawling racetrack. There will be rolling hills, flat, sterile spaces, big, flat indoor areas and everything in between. The difference is that we’ll use more than one environment – an aesthetic – rather than a giant contiguous space like Forge World. There will also be HUGE FLAT JUMBO Coliseum “walls” that you can instantly place as enormous floor tiles (or walls). All the spaces are being designed with flexibility and performance in mind. The inclusion of a new lighting engine and some unique palettes will make things look more varied and connected. Some simple examples – you can make Lockout and The Pit with relative ease and plenty of room. If you want to do something giant and meandering, you’ll have to incorporate some of the environments existing features (hills, cliffs etc).

With the new dynamic lighting in Forge, will we be able to make almost a nighttime looking map? And will there be lights at our disposal as well? - x HoMiiCiDe

We’ll reveal more about the environments later, and while you won’t be able to make a literal night time version, there will be an element that will enable a starkly different look than the bright daytime maps you’re used to – and the addition of proper lighting and shadowing on and in objects will make a radical difference.


I noticed that there was no "Weapons" menu selection in the Forge demo. Will we have the ability to place weapons on the map in Forge or will we be limited to using ordnance drops and loadouts? - Lehnaru

The menu in the Forge demo was not only a placeholder, but was actually pretty borked – it was dropped in just for RTX. Naturally the final menu will have complete feature parity with “old” Forge, plus several important new additions, and so yes, of course you will be able to place weapons – and vehicles at will. Custom games will also allow you to define your own loadouts so you will not be limited by your progress in the main Infinity progression.

In Forge, will the coordinate system we had in Reach be returning? Also, will the Grid be returning as a placeable object in Forge? - Nuclear Taco 42

Coordinates and grids are returning and will be in some ways more useful thanks to other features like magnets and so on.

Here is the archived video I got a linkt to from HBO.

http://www.twitch.tv/rtxlive2/b/324023201

http://www.youtube.com/watch?v=lSff_V8Vh-k