I just put the finishing touches on the Key Concepts guide and it is posted on the download center, here:
It includes the following topics:
We typically post documents in the doc format, but we are trying out two additional formats (pdf and xps). Let us know if you prefer one of these formats; we'll eventually be making a decision about which of the formats to regularly ship. You can reach our documentation team at momdocs at microsoft.com.
[Edited post to link directly to the document.]
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Doc preferred. If we would like to have it in pdf we can do it by ourselves :)