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If a space marine vehicle moves 12 inches (tank, not skimmer) can power of the machine spirit still fire one weapon?

Not in the current codex, but just wait a few weeks.............

will it change for sure with the new codex?

I think that has been confirmed elsewhere, by people who now actually have the codex or have sen it in stores.

So yes,
BS4,
1 (S5+) weapon up to 12" (even stunned or shaken)
2 (S5+) weapons + defensive upto 6"
All weapons if not moved

Did the old FAQ give POTMS to GK raiders, because it is not in the dex.

GK's have it in thier new faq. As for loyalist marines not yet to my knowledge until the new dex.

PotMS in the new Space Marine codex is the same as that currently in the DH FAQ.