Epic Games has a Trello for Epic Games Store now, discovered the link to the Trello within the Epic Games Launcher under "Settings" very last link says "Epic Games Store Roadmap": https://trello.com/b/GXLc34hk/epic-games-store-roadmap
According to this, Epic plans to implement cloud saves sometime in May: https://trello.com/c/Gqg3O5K5/17-cloud-saves
Mod support is listed for implementation within 4-6 months: https://trello.com/c/xqnzVcZz/27-mod-support-for-games
Achievements are listed for implementation sometime past 6 months: https://trello.com/c/apfJsxbA/30-achievements
According to this, Epic plans to implement cloud saves sometime in May: https://trello.com/c/Gqg3O5K5/17-cloud-saves
Mod support is listed for implementation within 4-6 months: https://trello.com/c/xqnzVcZz/27-mod-support-for-games
Achievements are listed for implementation sometime past 6 months: https://trello.com/c/apfJsxbA/30-achievements