I made a thread a little along these lines once before but didn't phrase it very well, and people ended up giving me devlog tips (not that I aren't grateful, of course), so... let's try again...
What I'd suggest is a clearly visible option on a game's devlog that either notifies or emails the player when the game is released.
Currently, when someone goes onto a devlog page, the main highlighted action is an 'Add to Collection' button. As far as I'm aware, this doesn't give updates about development. Following the developer does- but I don't think many people choose this option. I'm sure more people would choose to wishlist a game.
My interest's obvious- we're working on a big project and I want everyone who enjoys the beta demo and devlog to know when the full game's out, but I'm sure this would be good for players and boost itchio's sales too. Might need to call it something other than 'wishlist' though...