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*
*Being "A jedi who joined GOG.com 1034 days ago", blocks TET's force choke using Jedi techniques*
Hey, I did say there could still be new releases during the summer gems period, didn't I? ;-)