I see your dilemma. :) From a personal standpoint I would say I'm interested in reading a changelog/devlog whenever meaningful changes were made: Performance optimization, version for a new OS, support for an additional language, increased jump height, slower falling speed, noticeable updates for several sprites, new areas, items, or NPCs, fix for a game breaking bug, fix for a minor bug that nonetheless annoyed several members of your community enough to annoy contact you... Those kinds of things. And even if I don't take the time out of my day to look into "this weeks update", I am still glad when I see that a dev is still actively working on a game.
What I (personally) would be less interested about would be bugs that went by mostly unnoticed, updated graphics for less than a handful of objects, changes to menu borders, ...
All that being said, you should direct that question at your current community, if possible. And don't worry: You will have doubts about your final approach whatever you do. If you act now, at least you won't have to worry about not having made a decision yet, which hopefully makes you feel a little better. ;)