2015 On The Roman Calendar-Which Coin Says New Year?

Going by the now-obsolete "Roman Calendar" i.e. the Julian Calendar, today is the 20th of December. You've still got 13 days to wait until "Roman" New Years Day.

Very few pre-Byzantine Roman coins make mention of the word "year" (anno) at all; although many mention the year-counts of imperatorship of the emperors etc, few use the anno urbis conditae calendar favoured by Roman historians.

The closest I can think of to a "new year" coin is the "new millennium" coinage issued by, for example, the usurper Pacatianus in AUC 1001 (AD 248); you can see one of his coins on the AUC calendar Wikipedia page.