Surprised?! I was. I hadn’t heard anything either. Anywhere. From anyone.
The TSPL4 link is broken, but was not at the time of posting. Since the hardcopy hasn’t been released yet, I suspect that the link will be down until the hard copy is released.
The link is back up.
FWIW: I didn’t think it was worth bothering Kent by asking about why it was down in the first place.