Aldera.net just posted that they were wrong on the assination attempt front. It isn't Aurra Sing, it's another female bounty hunter, maybe Ambu Fett.
What if the attempt is on Palpatine. That's pretty juicy don't you think? Our heroes unwittingly protecting the man who will ultimately lead to their downfall. OUCH!
Assasinations
I am a big fan of the theory that Palpatine, at first, tries to have Anakin killed for two reasons:
1. Obi-Wan killed his apprentence, and revenge will be on his mind. In TPM book it ends with Palpatine saying something like "those who killed Darth Maul would be made to suffer"
2. Anakin is so powerful that Palpatine fears Anakin could destory him(how fitting) and foil his plans of taking over the Republic.
Re: Assasinations
I have a theory, based on a picture I saw of the packaging for the new Aurra Sing figure, that it is Palpatine who will be the target of the assassination.
On the packaging for AS is shows Plapatine in the picture and I think it had a cross hair over his head.
WHAT IF: Palpatine is the target and Anakin Skywalker prevents his murder, all in the name of being a good Jedi or course. This could make an excellent opener for Episode-II with Anakin saving the day.