But, Amidala was not a Jedi, so how can she come back like the other Jedi? More than likely, she will fake her death and go into hiding until the Empire is overthrown.
Why did Qui-Gon and Anakin, upon death, remain corporeal, while Obi-Wan and Yoda vanished? That question was rumored to be answered in Ep2, and obviously wasn't.
Lots of issues/questions get raised during the early release days of a new Ep, and are just part of the buzz.