Personally, I'd rather Shaw not return for a sequel. I never liked her character because despite the fact that she was supposed to be an unbiased scientist, she let her religious beliefs and "faith" interfere with her view of things. For example, despite the fact that the crew of the Prometheus has discovered evidence that God as we know it never existed, Shaw still chooses to hold onto her faith but when her partner, Holloway, is killed it is then that she starts to lose faith as symbolized when David removes her cross for fear of "contamination".
Stereotypes be damned, categorizing men (Holloway) as more logical and women (Shaw) as more emotional is no excuse for getting the audience to give any individual more rope when it comes to character analysis. Furthermore, following the cliché of atheists must be punished for their non-belief while the religious get to live because of their "spiritual journey" (one that was practically non-existent in this film) is a theme I find rather offensive and outdated. It is for these reasons that I believe Prometheus 2 would be much better if they just reset the story with different characters and only a slight connection to the first film.