They are not making a new punto,
But yep you guessed it, a model will come out called the 500 5door
We don't know this for certain. Some car mags have said this, but Fiat say the 500X is the last 500 derivative.
In Fiats most recent announcement the Punto is listed at 'Punto' for the future plan, not on the 500 side of the plan.
http://www.fcagroup.com/investorday/Pages/Home.aspx
Click on the 'Fiat Brand' section & its on page 69/70 where it shows their plan for our market (titled EMEA).