They have a lot of question marks in their rotation, but if healthy (I understand that is a big if), that rotation should be really good. Tanaka and Pineda are a 1-2 punch that could be tough to beat. Last year, the Yankees were 8th in the league in runs allowed (not great, but better than their offense fared) and first in the league pitching WAR. They have an improved defense this year, along with a pen that should be very, very good.
They were 13th in the league in runs scored and 11 in the league in offensive WAR. Scoring runs was a problem for them last year, and I don't see where they have improved in that area.