So you think they'll create a new brand (if they decide to do this) rather than just reuse the Autobianchi or Innocenti brands?
I know that there is some history between Autobianchi and Lancia - the old Y10 was an Autobianchi model before it eventually became the Ypsilon over at Lancia (if memory serves). So I'd be less inclined to want to see Autobianchi revived as a brand. Plus there is an active registry that exists online for older Autobianchi models (http://www.autobianchi.com/eng/reg_storico.htm) and not sure if that would somehow mixup their marketing efforts (if they were to revive the brand that is).
Innocenti, on the other hand, appeals to me a great deal and seems the right move if they want something that is distinctive and cheap. It has a history steeped in this and would do well in this role - at least I think so.
Just my two cents.