Does anyone think it's possible we could see Chief in the game?

@RaY_Z...

No. Noble 6 is apparently one of only 2 Spartans with a "Hyper Lethal" rating.

The other one I assume is Master Chief

AMAZING TRAILER.

Also yes that is Dr. Catherine Halsey undoubtedly at the end.  Noble Six is not Master Chief since thats physically impossible for multiple reasons.  Halsey is simply comparing the too of them since they are similar. Here's why.

1st.  Master Chief in orbit during the events of Reach trying to protect / destroy vital com data information from the Covenant, he himself wasn't actually on the planet and ends up fleeing on the Pillar of Autumn before Reach is even glassed.  He actually arrives at the first Halo soon after Reach falls and is in slipspace during its destruction.  

2nd.  Noble 6 is a Spartan III that was created by Kurt and his group on the planet Onyx and was completely separate from the other main group of Spartan 2's.  Their existence was known by almost no one whereas at this point in the war Spartan 2's were well known by both the civilians and military.  Chief is a Spartan 2.  

Now for the biggest question from the trailer, who on Earth was Halsey talking to and what is noble teams final legendary mission they are embarking on?  A couple theories on this are that Halsey is either talking to Aunti Dot an AI that has been revealed through looking closely at footage from Reach who we are unsure is a "smart" AI, or she could be talking to Cortana's sistrer who was supposedly de-comishioned and destroyed once Cortana was created but Halsey may have saved her since she has a long history of breaking the rules.  Also there are other people who are in the room who she may be talking to, this picture proves it.

But who's she talking to at the end. My best guess is Cortana "Great minds think alike".

Cortana was based on Dr Halsey's brain and personality and I like that Noble 6 (the character you play) is considered as lethal as Master Chief. It looks like one of Noble Team will have to carry and protect "something", possibly an A.I.

Also it looks like she's on a Covenant Ship.

How could it be Cortana?  She's on the Pillar of Autumn with Master Chief and Captain Keys.  

She's digital, she could easily be broadcast across space. They can send messages and live chat through space you know and they have holographic displays.

No they are 2 seperate spartans. She is just saying Noble 6 is the closest in all around skill to Master Chief.

I have a feeling that Noble teams final mission and ending of Halo 3 (I'm pretty sure the ending of Halo 3 and the destruction of Halo Reach weren't too far away from each other in terms of time)  where MC is on a ship going towards a weird structure have something to do with each other.

Didn't bungie say that MC would be in Halo Reach?  

I'm probably wrong about this.

lol you do realize its physically impossible to digitally transfer a highest tier smart AI on the scale of Cortana right?  Trust me its either Kalmiya or or Auntie Dot, who in all actuality may be the same AI.  The sister of Cortana and a direct clone of Halseys brain, thus she would still share the same values as Cortana as well as Halsey and would choose Noble Six since he is Similar to John 117 who both Halsey and Cortana love.  

Reach fell on August 30th, 2552 and Halo 3 ends in December of 2552 so all told the events are only roughly 4 months apart.   Noble Teams mission will certainly be extremley important to Halo 3 and 343's Halo 4, which is all but confirmed to be in development and to star the Master Chief himself.  

Bungie has explicitly stated that the events that happen during the campaign of Reach have huge impacts on the rest of Halo lore. 

Ah ok I didn't know the events of Reach and Halo 3 were months apart.....well there goes that theory lol.