This is either a lie or said out of ignorance. The devices (770, N800, N810, N900) are closed - a lot of their functionality depends on closed drivers (kernel or user space) from Nokia, so only Nokia can port meego (or any other OS) to those devices, but they already indicated they do not intend to do it. You can still hope that they give you the necessary information, either by documentation of the hardware they use or by opening their code, but there is no real reason to expect it to happen.
I would imagine it will be possible to port it to older devices too - 770, n800 & n810 as well as the n900.