Um, giving a look at the patch notes and seeing some discussion:

I think that we will NEED to be allowed to copy chars to Test. There are a lot of changes to high level play here... with all respect to Testers, we really won't know the balance until we see it and compare it to current characters. There are simply too many changes to make it predictable for everyone.

Of course, this lets people configure themselves for IPR earlier... but that only saves less than a day after the patch comes out.