I definitely think that Jane could be fired really soon now as the Jenna light clip theory seems to be gaining momentum. As Sherlock Holmes points out, we know Jade moves to Phoenix in Week 4 as she's seen with Tom in a junkyard task clip, whilst Ricky is seen as PM flanked by two women (Seemingly Gabrielle and Jenna) in the boardroom meaning at least six people are on his team. I think that that clip is from Week 4 and it appears Adam is the other PM. Next week's PMs will likely be confirmed tonight, whilst the Week 5 task will probably be cleared up in the next few days.
he most likely task for Task 5 is the fitness video one and seeing how much Stephen appears to be involved, the implication is that he's the PM. As for Sterling, by this point, if we've got the PMs right then Laura and Jenna have both yet to be the PM, so its a good bet that one of the them will be Sterling's PM in Week 5, but according to the light clip, neither is fired.