Cisco's Site Now has a data sheet posted about the new SR520 Routers!

There is also a Q&A posted as well on the Cisco Site.

These security routers are part of Cisco's Smart Business Communications System (SBCS) I don't see them available in distribution channels yet and I would expect when the products are actually released a new version of the  Cisco Configuration Assistant will be released to support them.  CCA 1.8.

The one thing I do notice is that The SR520 supports SSL VPNs where the UC520 does not. (or at least TAC won't support the config on a UC520)

I've also gone ahead and created a new forum on the site to discuss Cisco SR520 configuration.

Ted