I hope to see this in mods, but just in case they are late getting there, here's some paranoia to keep awakened PC's legit.
Possession traditions: a Spirit possessing someone (even a chanelling mage) can be seen like a Shamanic Mask w/ normal perception. The threshold is (6 - Spirit's Force), so if you are walking around w/ a force 6 (or 8 greater form) spirit mounting you, you are an obvious threat. I think this should be noted, as GM's currently don't let troll's walk around w/ Panther Assualt cannon's.
Watcher Spirits: I find the magic security detail to be missing in the NYC official supplement. However, it would be absurd to think that there's not a NYPD mage summoning watcher spirits to patrol. No doubt these spirits are reporting anything over force 3, and perhaps anything w/ a "force" in some places. At 2 dice, they are not the best spotters in the world, however you can't just walk through Manhattan w/ a quickened force 4 (or 6) spell on you. Or an active force 1 Katana focus, for that matter either-- with out some fear of it alerting an astral mage to project out and give it a once over.