You can see in the video that The Register linked to that this particular vulnerability is neither quick nor elegant but it is most certainly effective.  By entering an extremely long string of digits into the password field, accomplished with multiple copies and pastes, while the camera app is active you can cause the lock screen application to crash on all but the newest version of Android 5.  Unfortunately the effect of that crash is to drop you onto the phones home screen, thus allowing complete access to the phone.  If you are running a version of Android 5 you should consider switching to a PIN or pattern unlock, at least for the time being.

"If you've got an Android 5 smartphone with anything but the very latest version of Lollipop on it, it's best to use a PIN or pattern to secure your lock-screen – because there's a trivial bypass for its password protection."

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