Google appears to be increasing Gmail capacity

I noticed an article from ZDNet announcing that Google plans to double Gmail capacity--at least.. I was first a little leary since it is April 1st but then remembered that Gmail was announced last April 1st so Google appears to have a sense of humor.

Here are some screenshots from my Gmail account that shows that they are in fact bumping up the storage as we speak. Notice the total amount of storage available:

I guess what suprises me most is the fact that it is slowly building up to the 2GB capacity. Is this dynamically adding the available storage based on how much drive space is available to the system? Could they possibly be allocating this much storage for EVERY user instead of counting on the 80/20 theory where 80% of users use 20% of the resources while the other 20% use 80%??