Director Michael Bay announced at a fund raising charity event this week that the newest Autobot to join Transformers in the Transformers 3 sequel will be the Ferrari 458 Italia.
There is still plenty of time until we will actually see the Ferrari 458 Italia Autobot in Transformers 3 as the movie will play in theaters starting from 2011, July 1st, and as of right now the directing crew announced they will begin pre-shooting scenes in about a month.
Shooting for the Transformers 3 movie will take place in LA, Chicago, Washington DC, Florida, Texas, Africa, Moscow, and China and as far as the Ferrari 458 Italia Autobot we hope we get to see Megan Fox riding the hot Italian supercar.

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Source: Michael Bay