I have published a very brief essay on Jotwell concerning Thomas Piketty's Capital in the Twenty-First Century. You can find it here.
As you can perhaps see from reading it, it's less of an actual response to or full assessment of Piketty's book (unlike, say, Neil Buchanan's Jotwell piece on Piketty, which you can find here), than a preliminary statement of what I actually do want to write about at greater length. This reflects that I will actually be doing so. Further details to be available shortly.