Just gotten word via Twitter that Brooke will not be appearing in the Spartacus prequel, but they are not certain whether or not she will be appearing in S2 of Spartacus: Blood and Sand at this time.
If you want to see Brooke Williams in S2, you should politely let them know.
Tweet from spartacus_starz:
@brookefanpage Not sure for S2 at this time. Will not be for GotA. No Varro, no Aurelia.