Google has rolled out the latest update for the Android Device Manager app. This update brings the app to v1.2.12 and while there has yet to be any changelog posted -- the update is in the process of rolling out through the Play Store.
There doesn't appear to be much in the way of differences, however the folks at Android Police have spotted one key change. Google has added a Guest Mode option. Simply put, you can now choose the Guest option from the account name drop down menu on the main launch screen.
Once you select the guest option you'll be able to enter your personal Google credentials (email and password). This isn't what we would consider a huge update, but this does appear to be a welcomed change given you can now login easily (on a friends device) and not have to worry about whether or not that device will store your account details.
When using the Android Device Manager app in Guest Mode you'll be listed as "Guest" in the upper left hand corner. You should also take some comfort in the easy access to log out once you are done. Just look for the Sign Out option in the upper right corner. Otherwise, Guest Mode will still allow you to remotely track your device, as well as ring the device, lock the device and wipe the device.