There should be no problem updating your apps to run with 4.4 and the 4.4.2 updates. The app updates are being updated for the Kitkat updates daily and you should be receiving the notifications as they do. Most of the most popular apps have already been updated (many were even updated before the Kitkat releases). When you receive the update notifications, you can check the "What's New" section and it'll usually say that it's being updated to be compatible with Kitkat. The apps that haven't been updated are in process of doing so. The apps you say are broken are probably in the process of being updated. I'm sure the developers will get them out ASAP.