do the weekly updates add new content or just bug fix
Typically both. Since the dev just did a rather major content drop, it caused a lot of bugs with the existing code, so he still hammering out all the issues while still dropping content.
Weekly updates are normal around here. Only exception was when Arc was making the battle system.
Oh yeah, also just one dev. Content might be relatively small.
If you’re not impatient, it’s recommended to download every 5 updates.