The Futon Critic has a full list of shows / panels at the beginning of the TCA Summer Press Tour, the bi-annual event in which the various networks present their upcoming plans to the press.
What's interesting for Spartacus fans is the following on 7 August - since the prequel filming is underway most of the actors won't be there (you would assume since they are in NZ filming BUT you never).
SATURDAY, AUGUST 7 (Cable, Day 2)
8:30 AM Fuse
9:45 AM Starz
11:30 AM pm BBC America
12:45 PM Working Lunch/National Geographic Channel/WILD
3:00 PM pm HBO