What is the plan for ASIC's? Will it require a switchover as well? If it requires a switchover, why not do it now instead of waiting until ASIC's are already out and about?
I don't think ASICs will need any special support. P2Pool can provide getwork results fast enough for hundreds of GH/s (from a normal computer) and could be optimized for more. In addition, any timestamp rolling multiplies that.