Hopefully the exterior changes will be minor. It looks like they will be. It just needs enough to keep it fresh without losing its good styling.
The interior additions look ok & are needed, but I hope it's not going to be a mish mash of new UConnect unit and old heater controls, as they don't go together very well. I also wonder if they're going to have a cream UConnect unit to go with the Ivory ambience? Personally I think that whilst it's a bit clunky, Blue&Me is actually pretty decent & UConnect isn't good enough to replace it. Ford's SYNC that they make big claims about doesn't appear (on the surface) to offer a great deal more than Blue&Me, yet Blue&Me was first available way back in 2006 on the Grande Punto!
Sadly what I bet won't be changed, and what I think needs to be, is the 500s suspension. Having done a few miles in the Parents TwinAir 500 over the past week, it's the main thing that lets it down. The engine is a peach & it copes amazingly on the Motorway, but in territory that the car was designed for, it's bumpy, nobbly ride and tendency to transmit road/tyre noise really grates. I've not driven the 500s rivals but I'm sure they surely do suspension better than the 500?! Fiat really need to nail this I think, but I doubt anything will happen till we see an all-new model.