There are various considerations administrators will be taking a look at in the design of PRPPs. One of the things I know life insurers are interested in taking a look at is whether there is a way to incorporate some retirement stream security at some point along the line. It's possible that you could be looking at annuitizing some components as you go along. Those are the things that are still being explored.
On March 1st, 2012. See this statement in context.