I was in the new twingo, at Goodwood over the weekend.
First thing I noticed that you step up into it, like the floor itself is higher than the twingo 2. It feels smaller inside too. There is less room in the back seat now that the seat is fixed. Interior is a bit fancier looking, but it's still made from the same sort of plastic as before. (Lots of parts are the same, door handles, a lot of the switches, gearstick, handbrake, pedals, front seats etc). Seems weird for a twingo to have it's dash behind the steering wheel too.