John Hasler wrote:
Testing will not change. The way it will look from the point of view of a user is that a frozen copy of Testing will be created and the names 'Sarge' and 'Stable' pointed to it. The name 'Etch' will be pointed to Testing.
Hopefully this change is announced loudly enough, to change apt-proxy and/or /etc/apt/sources.list from testing to sarge.