Games that are not 100% confirmed, but there are information about the possibility of them coming to GOG:
A) Unspecified Cinemaware titles
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Forum post by Barry_Woodward B) Stasis (the parties are in contact)
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Twitter C) Two Guys SpaceVenture (only the will to publish on GOG)
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Kickstarter FAQ section E) Planetary Annihilation (the parties are in contact)
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Kickstarter countdown finale video - at ~1:20:54 F) Grim Dawn (the parties are in contact)
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Forum post by Solei Source:
Grim Dawn forum G) Cryamore (only the will tu publish on GOG)
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Kickstarter Update #4 H) Legends of Dawn (only the will tu publish on GOG)
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Kickstarter comment by Aurofinity & Dreamatrix (dev) I) Trial by Magic (remake) (only the will tu publish on GOG)
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Interview @ Digitally Downloaded K) The Dream Machine (the parties are in contact - the release is possible once all 5 chapters are done)
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Official Twitter L) Project Zomboid (only the will tu publish on GOG)
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Forum post by lemmy101 @ The Indie Stone M) Two unspecified Rainbird Software titles from 1980's
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Forum post @ Steam Source:
Forum post by SCPM N) Flashback and Fade to Black
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Facebook O) Satellite Reign (only the will to publish on GOG)
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Kickstarter update P)Soul Saga (only the will to publish on GOG)
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comment to the Kickstarter update Q) Homeworld 1 and 2
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press S) Next Car Game (only the will to publish on GOG)
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forum post T) Iron Soul (only the will to publish on GOG)
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website U) Legions of Ashworld (only the will to publish on GOG)
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blog V) Doorways (only the will to publish on GOG)
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post by JinseiNGC224 W) Sunless Sea (only the will to publish on GOG)
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kickstarter X) Spud's Quest (only the will to publish on GOG)
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twitter Y) Freedom Planet (parties are talking)
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kickstarter Z) Cosmic Star Heroine (only the will to publish on GOG)
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kickstarter ZA) Paranautical Activity (GOG contacted the devs)
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twitter ZB) Routine (only the will to publish on GOG)
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website ZC) Obduction (parties are talking)
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Kickstarter ZD) Confederate Express (only the will to publish on GOG)
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Kickstarter ZF) Dex (only the will to publish on GOG)
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Kickstarter ZI) XSEED games (Ys Chronicles+ ,Ys Origin, Ys: The Oath of Felghana) (only the will to publish on GOG)
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facebook ZJ) Wings: Remastered Edition (only the will to publish on GOG)
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Kickstarter