Just so others know...
Rothgar Lead Programmer had this to say in the forums:
I've reverted the changes for now and those changes will go into testing tonight. QA is working overtime on expansion tasks but will make sure the change doesn't break anything else.
Since it's a client change only, we'll push it to the patchers sometime tomorrow morning without having to bring the servers down.
When time permits we will consider some of the other options and come up with a solution that meets our needs without impacting your gameplay as much as the throttling does.
Link is
Here one post up from the bottem.