It looks like Humble are changing up the format of their monthly offering:
WHAT’S HUMBLE CHOICE?
Humble Choice is our latest take on the PC gaming subscription. Every month choose great games to keep forever.IT’S YOUR CHOICE
More games every month. You choose the ones you want to keep forever.NO MORE MYSTERY
All games revealed upfront. No more waiting to find out what you’re getting each month.SAME GREAT PERKS
5% donated to charity every month. Plus access to the Humble Trove and up to 20% off on the Humble Store.
What’s the catch? Different tier pricing plans:
But if you have an active subscription when they make the switch you go on the Classic plan which has the most perks and is still at the $12 price point. You get to keep this as long as you stay subscribed - so no more skipping months then.