I'm not sure there will be any new releases for the duration of the Summer Hidden Gem promos. Of course, I'm not saying there will necessarily be none, but there's a chance they're skipping releases during this period.
Maybe TheEnigmaticT can enlighten us?
EDIT Schratch that.
We at GOG.com found your lack of faith disturbing...
*watches as TET force chokes DrIstvaan*
GOG Moff Tarkin: "Enough of this! TheEnigmaticT! Release him!"
TheEnigmaticT: "As you wish."
*Dristvaan is released from the Force Choke*
(Sorry GOG.com, had to make the obvious Star Wars reference)