These rumors don't add up yet. Apple does not enter a market unless they can make it far better. Clearly "big screen" has been what people have been seeking. 32-inch and 37-inch are no longer considered "big screen". I currently have a 36-inch from Sony that feels very small in my family room. I have been looking to upgrade to a 50-inch for quite some time now but have been delaying due to cost and not finding the TV that I thought provided a great picture for a good price. I'm not looking for fancy features in my next TV like built-in internet apps so I can tweet or do Facebook. I'm not looking for 3D with or without glasses. I'm basically looking for a very large monitor with a great bright picture and fantastic viewing angles. I know that 99% of the time, the TV will be attached to Dish Network, Apple TV, Wii or my DVD player and will be used to simply show whatever those devices are sending on their outputs.
While I don't see Apple trying to compete in the TV market on specs (like screen size), I can't see them crippling themselves by offering 32-inch and 37-inch screen sizes since "big screen" is one of the major driving factors in television purchases. I would expect Apple to have a screen size in the 40-50 inch range and one in the 50-60 inch range. Maybe one in the 30-40 inch range would make sense too. That would make sense..... three models, three sizes, otherwise identical. I don't see Apple trying to make a 60-80 inch television to show off how big a screen they can make -- that's not their style.