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.

you have to ask vendor for their release note or change log

In my experience, bundles that aren't managed by a partner will often present you with a list of components that are being changed (created/deleted), and even give you options of which changes you want to overwrite your current configurations. That allows you to have some say and control for what gets changed, and you control the "when".