Perhaps this is a dumb question, but how do I go about figuring out changes made to a bundle? IE: Celigo Integration. I see there is an update, but was curious as to what the updates are before I install.

I don't think there's any way that I'm aware of other than contacting the bundle owner/publisher's support team. If they're really on top of it, it might be in the Admin Documentation (if there is a file attached), but I don't think that gets updated until you install the update either. I do know that when you go to install, it does show which components are being added/removed/changed before you push the button, but I don't think it shows anything about what changed, just that they changed.

@RJMNS very helpful, thank you!

No that just shows what is in the current version. To see what's changing in the update, you have to click Update on the bundle and then that info is on an interim screen before you push the button to kick off the install. I'd recommend testing bundle updates in a Sandbox anyway, so I'd install this update in your Sandbox to do some testing and you'll see what I'm talking about when you do the install there.