Here is the easy way to find out the version of the WAIK.
Go to windows Explorer and browse to -
C:\Program Files\Windows AIK\Tools\amd64
And for x86
C:\Program Files\Windows AIK\Tools\x86
Then check the Properties of any of the applications(bcdboot or Imagex) under these folders. Under the properties, go to the Details tab which gives the version of the WAIK.