There have been a few reporting this around this sort of mileage, it's the plugs, both of them!
They cough and fart mid revs and can sound a bit rough and rattly.
Mine did it and a new set sorted it out.
In regards to 2017 models.
It's just a mid life face lift like the 500 got recently.
A few tweeks to the styling like indicator repeators in the mirror covers, some new colours (which won't be a shock as only three or four are offered at the moment)
A couple of (or more like one) new seat fabrics, I'm sure they'll jam in a version of their Infotainment system in at least one trim level with perhaps a revised dash to make it fit (though the thought of them hacking a hole in the current one wouldn't surprise me).
You'd guess something new to the Panda, safety related would be offered as standard.
It would be on Fiat's shelf already, if not on the current options list.
I believe they'll also tweek some of the current engines for emissions reasons (so even thinner oil) and revise (cheapen) the rear suspension set up.
Seems a new Panda with new engines is due in 2020 (ish).
But we'll see/hear the new engines sooner, they are breaking cover in next years Uno/Palio in Brazil and perhaps some other markets like India. (those markets that G8 sanction due to pollution while looking the other way in their respective countries) and then appear in the 500 replacement before the new Panda.
I'm guessing, as it seems a trait of Fiat and most other manufacturers, that some of the current engines will carry over for a while, probably in the lower specced cars and/or markets they can get away with it, they'll be cheaper to buy, but more to run due to heavier emission/taxation.
You'd think this would likely be the TA as it seems Fiat have taken the FIRE about as far as possible, emissions/cost wise, but you never know, it could be with us for a lot longer yet if regulations allow!
I don't think the TA has been the massive success hoped of it, probably due to it's poor real world mpg figures, don't know why they didn't offer it as a Hybrid?
# There is not much facelifting done.
# Don't look like there will be indicator repeators in the mirror covers.
# They did a very nice job with the infotainment upgrade, involving your Mobile Phone with the system, no more separate TomTom unit.