I've been waiting for news on Private Moon Studios' Tale of the Four Dragons to be released, which is the fifth game in the AGON series. While searching for more info, I came across something even better: they are working on another Jonathon Hunt (Yoomurjak's Ring) game called Miazma. A search on Miazma turns up at least one article from a Hungarian game site, which can be translated by Google. One site mentions April 2015 as a release date. Also, here
is a link to the Private Moon site which has a trailer. They have more on the game (in Hungarian) in their links section. The release date on their site says 2015.