I currently pay $9.95/month, is the upgrade $90.00 annually?

Sorry about the confusion. That email was actually only intended for free users.

You will keep your existing low prices as long as you wish to keep you subscription. All existing subscriptions are grandfathered. The new prices only apply to new subscriptions. 

So, no, you don't have to do anything else to lock in the low prices. You already have them.