It's not an issue of "up to speed" or not.
USPS has not yet set up their staging area, nor updated their documentation, nor sent out the "follow-up email in early April".
Until then, your USPS rate calculations will continue to operate fine.
If you are looking for an update on their progress, contact USPS.
Zen Cart can do nothing to support the May 2007 rate changes or their API changes until they publish the details of the changes.




