Not really sure if they are planning on adding it to the PGN or not. My understanding is that they store the timing data in the DB so it shouldn't be much of a problem to included it.
Though, added a option to include it would probably be best as I imagine no everyone would want that.
PGNs with Time Data

Will the new version of Live Chess allow me to download pgns of my games with time spent per move? I see that there is a time tracker on the right now, but I would like to have it in the file itself. This is the main reason that I prefer playchess.com for live at the moment, and I understand ICC implements this as well though I've never subscribed there.