Capabilities are a very delicate subject in enterprise architecture parlors.
This book from 2003 (pre-dating Enterprise As Strategy by Ross et al) throws the people-dimension into the strategy-execution mix: talent, leadership, knowledge management, org-structures etc. Therefore, to me, this book does not feel dated at all.
If you think you know everything about capability building: take the time to pick this one up, or revisit it. Don't be put off by the low mean score here on Goodreads: it takes some experience to appreciate the importance and value-add of capability planning, and to be able to evaluate a contribution to the body of knowledge. It takes even more experience to put your own biases aside and to give a new perspective to a subject matter a chance to further your learning.