2012 Fiat 500 Abarth
And it looks like it will hold up. The documents, sourced via Car and Driver, show a pretty clear chart of upcoming 2013 models, and the Abarth is clearly listed under the "2 Door Convertible" group, while the 500T Sport is added to the standard Pop, Sport, Lounge, Abarth, and Electric lineup.
Having wrung out the hardtop 500 Abarth at Spring Mountain earlier this year, we know it delivers on many levels where the standard 500 doesn't. Whether the similarly-powerful, but non-Abarth 500 will show similar fun potential remains to be seen.
The convertible version of the Abarth is sure to win fans, however, as many of you commented that a soft top was the only thing holding you back. Of course, it will likely be the retractable-cloth-roof (a la 500C) sort of convertible, rather than the whole-top-comes-off kind, but even so, it means more sun in the cabin with (hopefully) all of the benefits of the Abarth.