Just to add some additional information:
Slingmedia confirmed that they do not support SlingCatcher with the 500 or 350. It appears in the directory when you login, but when you attempt to access the box, it asks for a "password". Previous models of slingbox would make you assign a password during setup, but since the setup is now done differently (via IR remote controller), there is no password assigned. I tried several standard default passwords including admin, sb500, and blank, but these were all invalid and I wasn't able to access the box in the end.
This is a huge disappointment. Slingbox no longer supports the slingcatcher, and there is one less media player on the market as BoxeeBox has been discontinued. So access is taking a major hit. On top of it, the technician I spoke with could not confirm whether the other slingplayer for connected devices would be supported going forward. I haven't heard if they work as of yet with the new slingboxes. Slingbox 500 no longer uses port 5001, but has switched to 5201 (again, no manual ability to override this). 5001 was the port for internet traffic to support slingcatcher, WD TV, Boxeebox, and iPhone/iPad platforms. So I'm not sure what the port change means for these other devices.
I sincerely hope SlingMedia will change this as it will certainly be a big disappointment to many of the loyal sling crowd like myself.