I was asking myself the same questions as TPL. Now what? I could not find an answer. I guess the Fiats are not designed for N/A so no quick import is possible. I haven't seen/heard of any new platforms/engines/models (real world models not EV) coming out from Chrysler so I would think we won't see anything new for the next 12-18 months. The only thing I can think of is they would scrap even more models (better than lose money making unwanted cars), only sell few models and eventually improve the interior quality and tweak fuel economy. Just my 2 cents ...
Small cars WILL come, just not in 12-18 months. But you can't expect Fiat to swap out half the Chrysler models in a couple months. These thing take time.
As for "eventually improve the interior quality," that was Chrysler's top priority even before the merger. First, the new Ram was a great leap forward. Its new interior:

Second, the Grand Cherokee has just been dramatically reworked, dramatically boosting both fuel economy and refinement. The new interior:

Finally, we've also gotten a teaser pic of a Chrysler 300 with an interior that appears to rival the Hyundai Genesis sedan. The teaser shot has funky lighting, but it still gives you a taste:

So Chrysler's putting more energy into its larger cars (the Grand Cherokee, the Ram, and the LX cars are the three big successes for Chrysler where I live) and just waiting for Fiat to get the small cars ready. Seems like an appropriate plan for me.