I have pre-ordered each UK release since the keyboard kindle in 2010, so the new one would have to give me something not available on the PW I use now to tempt me to upgrade to a newer model.
If they brought back the audio capacity or a bigger internal storage option I might be tempted but there's no guarantee even then I would be tempted to hit that order/buy button.
Otherwise it would have to be something pretty good to tempt me in any case.