Do the rear windows in the new Sonata go down all the way like they do in the Camry? Also, is the remote (fob) integrated into the key like the Camry and Accord?

No, no. Why not go check one out. It is a really good car. How busy can you be?

The Sonata does not offer keyless entry and starting like the Camry does, and as for the windows l can not tell you for sure but most cars today have windows that go all the way or most of the way down.

On my 06 the rear windows go all the way down (the first car I've had that did that since 1968, by the way) and the fob is not integrated into the key.

l have a 09 Sonata. The back windows do go down all the way. The remote is a fob, not part of the key. l love my Sonata.