I'm guessing it's a way to capture song ideas on the go. Maybe hum some parts, export to DAW of choice and maybe melodyne it into a song (probably a crappy hip-hop song... But it's a start)

I got an email with this from Alex:
 
>>
 
We've been busy this year cooking up a new platform that we hope you'll find to be a great tool for songwriting, and a perfect companion for SONAR (or any other DAW you're using). 
 
The platform is called Momentum, and we have a little teaser page set up, so you can get a taste and stay in the loop with us. Please take a quick look!
http://cwk.io/momentum-leak
 
>>
 
Not my bold lettering. Just as I copy/pasted from email.

Plug that leak.

Futile due to path of least resistance phenom.

It's not lifetime updates, but it is a start:
 

Would rather an official Sonar App that controls important parts of the software like TouchOSC/DAW. :(

...must be a millennial thing

I've reached my contentment with iOS apps.  Now if that could only work for PC.
I use mine for Kindle, groove3,MPV.

I'm having a moment. Um.

Seems to be a mobile app for logging creative ideas while you're out and about, then integrating them into your DAW when you're back at the studio . . . if so, it's amazing futuristic forethought from Cakewalk . . . might even be the only reason I have ever seen to get one of those phone thingies, sure could have used this a few days ago, had a great song idea, now it's mostly gone.