Yup, here's what I wrote back in April, and I just confirmed that it was referring to the same article (so this is not a new source):

On Mon, Apr 24, 2017 at 4:44 PM, Lawrence Jenab
 <larryjenab@gmail.com>  wrote:

And let's not forget that buried in the story is a publication date for Port of Shadows. I was  beginning to think we'd seen the last of new books from  Glen.


:(


On Wed, Dec 6, 2017 at 12:28 PM, Matt Cutter via glencook-fans <glencook-fans@mailman.xmission.com> wrote:
Holy smokes, I just realized the Black Company wikipedia page has been updated.

Port of Shadows has a tentative 2018 release:
https://en.wikipedia.org/wiki/The_Black_Company#cite_note-SH3-2

Wikipedia's source:
http://deadline.com/2017/04/eliza-dushku-star-the-black-company-series-adaptation-david-goyer-im-global-1202076367/

Possibly vaporware, but this is the first time I've seen a date attached to it!

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