No. Well, sort of. If you register to the
FlightGear devel-mailinglist, you will receive an email at the end of each month with a link to the latest newsletter. However, you will also end up with quite some emails about developments, questions, help requests etc. that you might not be interested in (you could set a filter in your mail-client though, to auto-delete (or move to a folder) messages from
flightgear-devel@lists.sourceforge.net, unless there's the word Newsletter in the subject)...
Besides that, newsletters are always announced here in the forum, and a link to the latest edition is offered at the main page of the wiki. Newsletters are released at the last day of each month, so setting a reminder in your cellphone/mail-client for that day could help too
Cheers,
Gijs