I use Fictfact.com to keep track of series, and they show upcoming books in series. Goodreads also sends out a monthly e-mail with new releases from authors you've read before.
I pre-order next books in my favourite series as well anyway, but that takes knowing there's a next book coming out, and some books become available for pre-order half a year in advance while others perhaps a month before release. So even if you know a new book's coming out at some point, that still requires remembering to check.
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