The games you get through Uplay+ are downloaded to your machine, and Ubisoft says that you'll be able to play "offline-enabled games" without needing to connect to the internet first. It's similar to Microsoft's Xbox Game Pass and Electronic Arts' Origin Access.
Uplay+ will run $14.99 per month, which grants access not only to Ubisoft's games, but also premium edition content and DLC.
Players that sign up before August 15 will get free access to UPlay+ for the month of September before being signed up for the monthly service plan in October.
In context: Game subscription services are becoming pretty popular lately, but not for no reason. However, Ubisoft does not offer any form of subscription services leading us to believe that this would be a huge announcement for their upcoming E3 2019 conference.
Uplay+ will give customers access to some of Ubisoft's most popular titles like Prince of Persia, Splinter Cell, and Beyond Good & Evil, as well as its upcoming launches like Ghost Recon Breakpoint, Watch Dogs: Legion, and more. Just be aware that, like most other trials, Uplay+'s will autobill you once it ends; so be sure to cancel ahead of time if you lose interest.