This 2012 OEM HU with the 4.3" screen looks like it's a close relative to one introduced in some 2011 Foresters. See this thread:
New HK LCD capabilities
Here's a new link to the zautos.com 2012 Outback spread
. Model number on front of the HU looks like PE627U1
The Forester HU does have rear camera capability. Not all Foresters with that HU have the camera (and some models with that HU may not even have the pre-installed harness that goes from the HU to the tailgate).
Radios with HD use the same AM/FM antenna input for both analog and digital (HD).
ADDED: See pictures and pin-outs in this post