The Humble Monthly subscription is gone, and its place is now Humble Choice, a new monthly service in which you choose which games games from a selection of 10 games every month. If you were paying for Humble Monthly became Humble choice, you'll get all 10 games for the same fee you were paying before.
The first 10 games from Humble Choice have been revealed. They include Shadow of the Tomb Raider, Blasphemous, and Phantom Doctrine, in addition to seven others. If you were converted to the $12 USD/month Classic plan, then you don't need to make any choice: you get all 10. You can see a list of the games in the list below.
If you're a new subscriber to Humble Choice, then you'll have to pay more money for fewer games depending on your plan. Premium costs $20/month and gets you nine of these games, while Basic comes in at $15/month with only three games. Each subscription comes with additional benefits, such as a library of DRM-free games, access to Humble Originals, and a store discount--the $5/month Lite plan gets you some of these benefits with no games. You can learn more about these plans at Humble.
If you're already a Humble Choice subscriber, you have until December 27 to unlock your choices. At that point, you'll be charged for the month and sent your games. If you want to cancel before then, you can do that on Humble's website. However, you can unlock your games and start playing now, but once you do so, you'll be charged.