Hi, yes--we definitely want to get a dev blog up and start talking about some of this stuff!

Re: conflicts, in the case of a scalar value, last in wins, and the system (if you consider the server and each client as nodes in a distributed system) is eventually consistent (i.e. everyone will eventually see the exact same state). In that particular case, we show the other user's profile picture and highlight the cell to flag that change so you realize somebody else is editing at the same time as you.