This will be technically the 3rd installment of stable v17.1 appliances and the 6th release for 17.x (see the first 5 announcements here if you wish). As previously noted, all of these apps have the v17.0 bugfix applied (many had no offical v17.0 release).
After a bit of a delay - due to other competing priorities; such as our webserver dying - the v17.x release continues. As per previous updates all these appliances are being built as v17.1.