If they do a quick fix, it's fairly normal for them to not release detailed patchnotes. Hotfixes aren't formal patches, and the development team doesn't necessarily have the time to put together a comprehensive list of what's going out. Also, they don't want us to know everything that goes in patches regarding spam-blocking, etc.
As a guess, i'd say they are probably minor patches to security exploits and such, being dished out too fast for them to document (or perhaps being too sensitive to make public).
Right now they are soooooo flooded I'm sure. ESO has been highly anticipated for years. Millions of people flooding the gates. I bet they are having trouble juggling all the eggs without dropping a few.