Yes, fairly possible except for the fact that the devices were not really ever released to public, never ever sold anywhere.
I am not sure if GPL is valid in a case where you got hold of a development device.

Thee are 2 alternatives that could happen if you contact sourcecode.request@nokia.com on the matter;
either they may actually send you the open-source parts on a DVD or more likely they'll demand that you return the prototype to them.


I'd imagine the HW on Meltemi is somewhat better, probably there's more core memory but CPU-wise they might be similar.

Future Discussion:
1) Nokia RM-784/RM-792 PROTO B1 HWiD 0102 [Meltemi OS] [UnReleased] (Possibly Meltemi FW Files (!)
2) Nokia RM-784/RM-792 PROTO B2.4 HWiD 0240 [Meltemi OS] [UnReleased].