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I will try to answer your questions in order:
Is there currently support for the new Turtlebot in Fuerte? Currently, yes, and we will build Fuerte images for the new TurtleBot.
To what degree will code for the new Turtlebot be backward compatible with the old Turtlebot. Will the existing Turtlebot node still work with the new base? Or will there be a new stack? We are attempting to maintain the code as close to the current structure as possible. There will definitely be another package for communication with the drive base. Code which is written for an old TurtleBot should work with a new one (unless you're using messages like turtlebot_node/sensor_state). Code which is written for a new one should also work with an old one (unless you're using Kobuki-specific messages or require the better sensors you will get with the new drive base)
It looks like the new Turtlebot is designed to provide power to a laptop. What laptop(s) will be supported? I've been looking at the Acer Aspire One AO756-4854. Laptops are a constant source of frustration for us, as manufacturers are now EOLing their laptops on a 6 month rotation and they never work out of the box with Linux. We are currently shipping the Asus 1025C with our TurtleBots.
Is the low-level interface to the Kobuki base compatible with the interface to the Create? Is there a published specification for the Kobuki interface? No, it is not compatible on a driver level. There is no formal published spec yet.