It's nothing especially amazing as far as hybrid tech goes, but it's just nice to see something more subtantial than a new paint colour for the Panda (and 500) to keep the interest up whilst they put a longer term plan in place, probably with the help of Peugeot following the merger.
As is very well documented, an all-electric 500e is coming in the next few months,
which is a completely new car on a new bespoke platform, so that'll be the big news (along with proper hybrid versions of the Jeep Renegade & Compass, which could easily be transfered onto the 500x). This just stops the 500 & Panda look quite so 'old'. What's not totally clear is whether the 1.2 engine will go completely? If it does they'll need to be very careful with pricing of the new Mild Hybrid, otherwise they'll probably find sales collapse, particularly on the Panda