Include everything. Mention when you change them.
For example, say that you were to nerf stealth in your game. It would not be a good thing to leave that out of the patch notes. If you did leave it out, you should definitely add it in. Also, when you add it, make a note at the top, maybe with a big UPDATE line, rather than listing it in the middle of other changes. The same goes for everything else you missed the first time through.
As a parting note, it might be worth including an explanation of significant changes to powers, especially when you have promised to do so. A simple “We thought stealth was too useful PvE even after the last couple rounds of nerfs” might be nice.