(UPDATE!) Release dates:

The Well: October 8th
Silent Killers: October 15th
The Legend of Inky Hearts: October 22nd
28 Pranks Later: The Aftermath: Halloween/Nightmare Night

Links to stories:

The Well: http://www.fimfiction.net/story/342673/the-well
Dear Diary: http://www.fimfiction.net/story/342370/dear-diary
Dear Rarity: http://www.fimfiction.net/story/342729/dear-rarity
Dear God: http://www.fimfiction.net/story/343033/dear-god
28 Pranks Later: The Aftermath: http://www.fimfiction.net/story/342607/28-pranks-later-the-aftermath