According to this old article
Chrysler's PT Cruiser is celebrating its sixth birthday, but the Chrysler group still hasn't decided what to do about a successor model. The Cruiser has received only a minor face-lift since its debut for the 2001 model year.
The holdup: Key decisions have to be made about styling and muscle.
Chrysler group COO Eric Ridenour says there is debate within the company about how retro the next PT Cruiser should be. Said Ridenour: "That is always an issue when you have a car that is unique - what do you do next?"
Read More at
PT Pickle - AutoWeek
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Maybe Chrysler do not have much idea so they are polling for ideas on what should be include in the next build.
They should continue to maintain the look which makes it uniquely retro
