cran2deb repository and Squeeze?

Hi,
I am curious what will happen to cran2deb:

deb http://debian.cran.r-project.org/cran2deb/debian-amd64 testing/

When Squeeze is released? I really hope this service will continue. It
has been great being able to aptitude install R packages.

Additionally are these packages signed and is there a key?
Chris