We are also working on off peak usage as well. This will add to the existing usage. No time frame or specs as yet, but as always I'll keep you posted.
Do you mean on top of the 100Gig?
If so you are going to get a lot of new customers.
When I was with Zen I was on the 2meg 100Gig product and I don't think I ever went over the limit so I know it would suite me.