Amazon's Kindle e-reader family seems to have lost a member along the way, with the disappearance of the Voyage from its Kindle Family listing.
In years past when Amazon has refreshed its Kindle e-readers and Fire tablets, it has done it in the summer or fall. The high-end Oasis was last updated in October 2017, but the most recent midline Paperwhite last saw changes in 2015, and the basic Kindle in 2016. Chances are one or both of the older models will receive an update in the near future.
Amazon would not directly confirm that the Voyage had been discontinued, instead remarking "Customer response to Kindle Voyage has been incredibly positive and we've sold out." Since there are no new models listed anywhere on the site (even as out-of-stock), it's possible that the e-reader has sold out in perpetuity.
First published Aug. 20 at 7:08 a.m. PT.
Update at 8:23 a.m. PT: Added Amazon's response.