Well I just got this email reply from the H/K support team:
"Good morning and thank you for your inquiry. We do not have a full list
yet as the firmware update is not completed. However, the main thing it
will fix is an LFE issue. It will improve video quality and HDMI
stability. It will also add 7.1 LPCM support as well as 1080/24p
support.
Once it is released it will be posted on our website for download. We
estimate it to be released within a month or so.
I hope this helps.
Best Regards,
Vu Le
Internet Support Specialist
Harman Consumer Group
Northridge, CA"
Glad I got my avr-247!
I am not aware of an LFE issue, at least on my receiver. Nice that some companies continue supporting their non-flagship models. Would much rather that this type of updating became the norm instead of offering new models with just a few more (sometimes less) features.