Baltimore Ravens, Cleveland Browns or Pittsburgh Steelers*
New England Patriots
* This is complicated but check the standings afterwards and the Jets will face whichever team ends up in the same position (ie 2nd if the Jets win, 3rd if they lose but the Bills also lose or 4th if they lose but the Bills win) in their division.
Jacksonville (if the Jets don't win on Sunday, but the Bills also don't win), Tennessee (if the Jets win on Sunday) or Houston (if the Jets lose and the Bills win)
UPDATED: If the Jets win on Sunday they will finish second in the division by virtue of having a better divisional record than the Dolphins. However, if they lose and the Bills also win, they will finish fourth.
The full schedule is usually released in April.