I got the go ahead to share pricing, so everything stays pretty much the way it is with the addition of on-demand rates for usage above the included amounts. The on-demand rate for Blob Data Transfer depends on the region, but looks like $0.05/GB for most US regions
Blob stores created before GA (which is coming very soon) will have a 3 week grace period before billing activates, while stores created after will activate billing immediately.
