On multiple occasions, Johannes (the 360 Mgr. on the Enchanted) told us that when they start charging, it would be $150pp....so I would expect it to be in that general ball park.
not really but it all depends how long you are on board. They do move staff around and some leave the ship when their contracts expire....sometimes mid-cruise
we submitted ours earlier this week, and it only took 24 hours....and the credits came for an October cruise, and for 2 in Feb and March of next year (9 months out)