I think the answer is in the still image or the looping video on that teaser page.
 
I'm thinking the most obvious thing is SONAR on Mac, although it's not something that I would like to see since that means eventually the focus on the PC side will fade. Also, it doesn't actually benefit anyone that uses SONAR on PC.
 
I took a close look at the video there and one thing I noticed is that the Melodyne animations are very smooth. Unfortunately Celemony developed Melodyne on Mac and graphically optimized it for Mac. You need different kinds of optimizations for graphics on the PC, and Celemony can't be bothered. It has always been sluggish on the PC. I have a very fast PC right now and for instance scrolling in Melodyne is not nearly as smooth as in the video. Then again the video might have been "Photoshopped" (whatever you call the equivalent for video), so might not mean anything.
 
Hope I'm wrong! Hopefully it is actually something that we as PC users can benefit from

lfm
I think Gibson is buying Softube and will incorporate Console 1 fully into Sonar prochannel...would be a good move.
 
That kind of hardware to directly position on any track really quick, and get your work done what you had in mind for that track.
And since hardware is so simple and idea is so brilliant it will be industry standard.
You don't need 24-32 motorized faders, it's just expensive.

We're not buying Softube but we've got full Console 1 integration coming. And thats not even part of the announcement :)

My only question is: how much?

24/7 free LANDR? 

I just got my email

Sonar on MAC would be huge! Also an idea that hasn't been mentioned is the possibilty of Cloud Collaboration.
I know Sonar has Gobbler integration but, Collaboration the way Pro Tools is doing it with 12.5 is different.
Hell, how about cloud collaboration with any DAW? Like OMF for cloud?

Awesome...you made my day. Shhh! 

WOW OMG I just realized that if the Big News is Sonar for MAC, that just might be yet another big Nail in Avid'S Coffin! Don't get me wrong, I'd hate to see Avid die (JK I would totally enjoy this) Their customer service BLOWS, their subscription plan SUCKS. Bring on SONAR FOR MAC!

I think SilkTone is right.  My guess it's a brand-new DAW, that's also available on a MAC, and it probably has more Project-5 like capabilities for EDM production.
 
I base this guess on what Michael Hoover said in past interviews, The upcoming feature page for future features only include generic drawings, no real screenshots.  There's also haven't been much added to the upcoming features lately.  Finally, the fact they used a DJ image makes me think they are trying to target that audience. 
 
What do I win? :-)