A lot of inaccuracies in this thread. With regards to the TwinAir 105bhp being a bit of a dog, that's not what I found when I drove it in a 500L and in the MiTo many people love the pace. It's not as economical as it's claimed to be, not by a long shot, but neither's the 85bhp TwinAir or most other tiny 2 or 3cyl petrol engines. I personally don't think the off-beat thrum suits bigger cars (or even the MiTo), but it's a matter of personal taste & I wouldn't say it was a dog purely by its design.
On the Alfa forum at least, it would seem the MultiAir failures are a little more extensive than ought to be expected with a new engine, although as per my earlier comment, some of it seems related to the wrong oil being used or oil left too long between changes. Not in all cases though I should say - some have failed at around 12,000 miles, so the oil wasn't old and it was still the factory oil in there.
There is not only one MultiAir engine available, though the Alfa configurator is hopelessly out of touch with what you can actually buy - the 170bhp is available in the Giulietta but the 140bhp is available in the MiTo. The Giulietta has 2 petrols (1.4 TB 120 and 1.4 MultiAir 170) and 3 diesels (1.6 JTDm 105, 2.0 JTDm 150 and 2.0 JTDm 175) and will gain the updated 1.7 TBi in the UK soon. The 1.7 TBi & 2.0 JTDm 175 are TCT Auto only.
MiTo has the 0.9 TwinAir 105, 1.4 MultiAir 140 and 1.4 MultiAir 170, plus 1.3 JTDm 85 and 1.6 JTDm 120. The trouble with the MiTo range is the two MultiAir's are only available as TCT Auto. This, given Renaults issues with lack of sales on the new RenaultSport Clio in Auto-only format, seems more of a mad decision than the engine choices themselves. I've driven the new MiTo 140 MultiAir TCT and it's a rapid engine and good gearbox, but do I want to be forced to have an auto in a supermini sized car? No! Especially when the only petrol manual option is the TwinAir. That'll do nothing to help the low MiTo sales. The range in the Giulietta seems fine to me though, being a mix of Auto and Manual options. A manual option for the 1.7 TBi would've done no harm though.
All cars on the Fiat Configurator say 'whilst stocks last', even newly launched models, for some daft reason. I doubt the Punto will be pulled yet, but as the Abarth Punto Evo has just gone, you never know. Perhaps they're gonna pull an Alfa 159 trick & discontinue the Punto years before a replacement is ready. It makes zero sense from what I can see, but then few of Fiats recent commercial decisions make sense to me.