Most of the time you will see when they start to hit, as people mention ggetting their first ones.
I hvae not seen a single Denali quarter yet for the last design of 2012 yet, much less thoughts of 2013.
If memory serves, most of the time it seems pennies come out first, then other coins. Pennies in February or March, and the rest from March - May, depnding on the area you are in. Hope that helps.
See any Denali quarters yet by the way? Anyone?