In the Q3 earnings call they said a 25% increase in premium seating. We can speculate that to mean 2 more rows of J (going from 37 to 45) and 1 more row of W going from 24 to 32. This would likely lead to a loss of a few rows of Y, or a reduction of lav and galley space throughout the plane, or a combination of both along with fewer MCE seats. That's all guesswork at this point, of course.