According to +The Next Web, comments posted on the app will now use your real name. I'm assuming a set-up process is now in place for users who have yet to merge their +YouTube account with +Google+. This is similar to how Google insists on users using their real name for reviews in the +Google Play store.
|YouTube on the Nexus 10|
DownloadYou can grab the latest version of YouTube for +Android by visiting Google Play on your devices, or alternatively, click the button below.
Source: The Next Web