Spoilers What familiar characters might we see...

EMH Mark 2 for the win.

Kor

 

honestly the only plausible one would probably be Robert Picardo as back up program of "The Doctor" as he would probably still be traveling to Earth.

 

They arrive at the same time.
Except no one on Earth is home.
They look at each other, opening their mouths to question... fade to black.
See you in season 4.

 

Bashir had also been approached about being the template for the long-term medical hologram for outposts and whatnot, so I guess he could show up if they need a familiar face.

 

Still reeling from the trip into the future the bridge crew sits in stunned silence.
The view screen flickers on the Discovery bridge....
Images slowly appear....

Data and the EMH are standing on the bridge of the Relativity with Daniels and Captain Braxton.
In John Candy-like fashion Daniels says "Sorry folks, the futures closed"
Bright flash and they are back to the original timeline seconds after they left and all evidence of the "Red Angel" and the "sphere information" have been wiped from the computers.

 

No.

 

I'm sure we'll see the Iconians finally, since they're a favorite fan theory every season. Maybe they fled to the future, too.

 

This would be a deep pull but what if Daniels or Braxton shows up?

 

Common sense says no, since they're a century past Daniels' era and 400 years past Braxton's. But Discovery can't not reference prior Treks, so I won't be surprised if they show up.

 

Common sense? Even though they are assigned to a time ship?

 

Trek time travel does seem to defy common sense usually. It seems like a decent time ship would be able to go forward, not only reverse. Otherwise demand a refund from the dealer.

 

I don't care as long as they give us more Andorians. Got my hopes up when they introduced Shukar in S1, then they only had like a 90 sec blip of the unnamed S31 Andorian Admiral (thankfully played by Riley) in S3, then nada. *sigh*

 

In the new trailer, it looks we've got some Trill pools, and the most obvious explanation is it's for the purpose of making a connection with a blast from the past - Dax - to get caught up on the past millennium.

 

There's also an Andorian shown.
As well as a MORN-like character.

 

And a Cardassian.

 

Hasn't it been canonically said that Trill symbionts have a lifespan of "only" 550 years or so?

 

Could be, but since it's the future, maybe they've found ways to extend their lifespan, just as humans are always endeavoring to do for themselves.

 

Memory-alpha says they "could easily live beyond 550 years.", there is no source next to the line though.

 

As kind of a side question: would fans like to see actors again who were left behind in the time jump - but in new/different roles?

With Mary Chieffo, it's easy as a matter of taking makeup & stuff off, with others it would be a matter of putting more makeup/masks on. I grew attached to a lot of the actors who were in seasons 1 & 2, and it'd be great to keep them in the fam somehow!

 

Yes, I've said a couple times before I hope they find another character for Mary Chieffo to play. It would suck to not have her in the series anymore, just because they shifted time-frames.