This has been discussed a few times...but unlike automotive we do not shut down for a model change over like they do.
So many times you will get a 2014 with the 2015 changes already in place. Also, if we have a good idea, we'll go ahead and make that change right away, not waiting for model change. We make the changes as we get the parts/protos/etc. So they may not all happen at once, but our goals is to have them all done by time the 15's roll out.
So if you see late model 2014's that is normally what you'll see on a 2015. If it has the Jensen radio you should have a pretty good idea of what you're getting.
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