Yup, the issue on these two new devices is entirely linked with FW 5.5/5.6 being currently impregnable *when starting from scratch* (and from a purely SW standpoint, I'm leaving the serial thing on the side on purpose), and of course being the initial FW releases for those devices (which makes the downgrade issue moot for jailbreaking purposes).
The downgrading issue just happens to make the *recently shipped* PW2 fall into the same big basket of nope, since they now usually come on FW 5.6
. [And downgrading had for quite a while been the first step to go through in order to jailbreak one, which is why the two things are linked in this context].