"When a user reaches the limit, administrators can purchase the necessary space of 20GB for $ 4 per month to 16TB (Google Docs are not counted in the quota of storage space)."
I just bought 80GB a few minutes before the new pricing page went up. When I go back to my Accounts page and click on Storage-More Details I see the new pricing, but under my 80GB at $20/year I see the following: "* Your current plan is no longer offered.Learn more"
There is nothing yet under the Learn More link, but I can see that my next charge will occur next year. I hope that means old storage buyers are being grandfathered in.
Thinking about it some more, I should've gotten 200GB for $50.
I decided to try out Microsoft Skydrive which offers 7Gb free and has 20+7Gb for 10$/year