The XDK is device sold by a separate Bosch division : Bosch Connected Devices and Solutions. They do use Bosch Sensortec sensors in their modules, along with components from other vendors to make a complete system. The XDK is supported in a different community : http://xdk.bosch-connectivity.com/community
Regarding your question related to the App board 2.0 (with bluetooth). I cannot recomment using it with BMI088 or BMX160 for motion tracking wirelessly. The Bluetooth 2.0 Serial port emulation has a few drawbacks, such as bandwith limitation and packet drops, which can upset motion sensing algorithms. I would recomment that you run the motion sensing algorithm inside a BHI160 sensorhub locally and stream the result wirelessly. A few packet drops will then not impact the precision of the tracking.
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