Current eps estimate for Q1 is for 13.45. If margins increase due to the 5c, a higher eps should be seen. Leading to a better stock performance into the end of the calendar year.
If we assume Apple produces flat revenue growth (which is conservative given the new product lines and expected iPad refresh), with only a 1.4% increase in margins from Q12013, Apple may produce a 7% beat. (Thanks to the buy back.)