This is from G4tv.com, so I'd say it's pretty much a done deal: 

The Bee Gees are coming to Rock Band 3. The iconic 1970s tight-pants disco trio is bringing six of their most famous tunes to Rock Band 3 as downloadable content, including, of course, pro versions of keyboard, bass, guitar and drums. Here are the tracks:

• “Jive Talkin’”
• “Night Fever”
• “Stayin’ Alive”
• “Nights on Broadway”
• “Tragedy”
• “You Should Be Dancing”

They will be available on November 16. 
Read more: http://g4tv.com/thefeed/blog/post/708565/bee-gees-coming-to-rock-band-3.html#ixzz150NqBtxb

Dude.......FUCKING YES!!!! 

I have the feeling my husband won't be thrilled but I'm looking forward to picking up at least a few of those.

One might say that the Rock Band DLC service is, stayin' alive!  
 
... 
 
Admit it, you've seen lamer jokes. 

I want to see and hear Brad do his falsetto with the Bee Gees. Make this happen Giant Bomb.

Night Fever and Stayin' Alive are must-owns. I'm sad about the omission of I started a Joke, though.

Might get Stayin' Alive for the lulz, but that's it.

I'm going to have to get my perm done before I can play this. 

Holy shit. I have to get Rockband 3 now.

" One might say that the Rock Band DLC service is, stayin' alive!   ...  Admit it, you've seen lamer jokes.  "

" I'm going to have to get my perm done before I can play this.  "

" Holy shit. I have to get Rockband 3 now. "

Awww yeah. I get to celebrate my birthday with the Bee Gees.

Boo this. Still waiting for my Faith No More track pack :(

Stayin' Alive FTW. Probably getting more too. 
 
Edit: I just realized Harmonix had access to "Stayin' Alive" and didn't put it in Dance Central. I need to slap someone.

Just when you think it can't get any better!

I think if I tried to do the vocals to any of those songs I would end up sounding like Tom Waits when I am done.