The in-game single mission temp powers give you a significant advantage against the opponents you're facing. (I've even avoided going back to the contact until I exhausted the temp power, it was so useful.) Seems unlikely they'd give us something that would make a mission easier to farm in MArch.
I've played a few where the holo-contact told me something like "take this communicator and contact me after you find the box." Just do that. It doesn't actually give me anything, but it filled out the story very nicely.
Shouldn't Mission Architect be able to give out temp powers that'll last for as many missions in the arc as the creator wants, or limited within the arc? This'd include weapons, travel powers and disguises (such as the one from the anti-midnight arc).