Slightly odd - on the first page of the release notes:
The following versions can be upgraded.
Versions can be upgraded
None of which (AFAIK) has been seen in the wild (or are they around somewhere, like the snape?)
The whole pdf sounds like it is meant to be read by redistributers/testers only, not for end users. Take a look at the word "secret" on each page.
This is what happend at huawei:
"OMG, finally vodaphone gave theire ok, so lets release this crap, im getting sick of it, people are asking for months now..."
... without taking a look at the contents of the actual rom-image.