Caroline Spelman and Alan Duncan have both been moved from their current jobs but are staying in the Shadow Cabinet. This suggests that at least two of the current members of the Shadow Cabinet will be leaving.
Other rumours doing the rounds at the moment are that Dominic Grieve will be moved to Justice and Nick Herbert to a frontline job, either Work and Pensions or DCLG. There's also speculation that Andrew Mitchell will move back to domestic portfolio.
Update: To no one's great surprise, Peter Ainsworth has been sacked. He was Shadow Environment but faield to get much press or gain policy traction in the brief much to the leadership's frustration.