The features are added to your account at no additional cost for your current term. However the renewal of your yearly contract will be at the new price.

I got a this mail:

> Dropbox Plus just got an upgrade. And a new price—starting on [xxx] , 2019 (that’s your next billing cycle), Dropbox Plus will be $119.88 a year (plus any applicable taxes).

Ah I see, that is quite unfortunate. I'm guessing the changes are mostly a cover for inevitably having to raise prices.

Also, I've been watching their stock price, so presumably they have been too.