The latest weekly update from Bungie gives the scoop on where Reach is at in development. Designers Derek Carroll and Lars Bakken and Engineer Luke Timmins turnout a great interview, talking about the importance of multiplayer playtests and the difference from playing in a lab and playing at home. The update also mentions new unlockables via Halo 3: ODST and Halo Waypoint, which is due to launch Nov. 5th. Also…