I think it's Cakewalk's app for capturing ideas on the go with your smartphone, or wherever. Propellerheads (now Allihoopa, a Props spin-off corp) has had an app like this for a while now called Take (and another called Figure for beats). Younger people love this stuff apparently and so I believe Cakewalk is fairly astute in doing this, trying to change with a changing market -- if indeed that's what it ends up doing. Sort of a lightweight idea catcher that works wherever you are.
The email header says: Introducing Momentum for iOS/Android/Mac/Win/VST/AU/AAX
I think it's fairly harmless folks. Optional even.
Check out Take for WTF I am talking about lol
https://allihoopa.com/apps/take Edit: They now also have something called SoundTrap that looks even more capable for on the go stuff:https://allihoopa.com/apps/soundtrap
This is where things are going folks.