Here is the release from the Yankees regarding tickets:
TODAY’S GAME AT YANKEE STADIUM POSTPONED
Today’s game between the New York Yankees and Tampa Bay Devil Rays at Yankee Stadium has been postponed due to poor weather conditions. No makeup date has been announced.
Fans holding paid tickets for today’s postponed game may use them for the rescheduled game between the Yankees and Devil Rays (date and time to be announced) or may exchange them for any regular-season game at Yankee Stadium within 12 months (subject to availability).
Tickets can only be exchanged at Yankee Stadium Advance Ticket Windows (open Monday through Saturday from 9:00 a.m. to 5:00 p.m., Sunday from 10:00 a.m. to 4:00 p.m., and until the 7th inning of any regularly scheduled home game).
Look for cold weather the rest of the week, but the games should be played. I would guess that they will push Pettite back to Thursday night, but nothing is official yet.