I imagine, being that the 1st is a maintenance day and they'll have the opportunity to make ingame adjustments to things, what we're more likely to see is Dalamud in its most massive state, looming just over our heads and this music playing across all regions and cities 24/7 until the game concludes on the last day. http://www.youtube.com/watch?v=7ZITw3Ub-K0

With something like non-stop Garlean attacks across all the regions, making even some soldiers trying to sack the cities themselves? No drops on the soliders of course, no achievements for killing them, just slaughter!