There were 5 for 8.1 preview. Check the associated KB articles to see what is fixed.
Sorry, I should have been more specific. Yesterday I downloaded the 5 updates. Before I did, I clicked the "View Details" next to the update, it had a generic statement and then said to log onto the Microsoft Download Center to view the details for what was fixed. I made the mistake of updating and then trying to do that. I have been unable to find anything on the Microsoft site, especially because I can't search that well - "View Update History" doesn't work, so I am not sure the exact update numbers to help me find anything. So far the only thing I have noticed after the update is my Microsoft Sports app crashes now. If anyone else notices anything, or has more info, let me know!