Yes, it DO locks very different now. You can’t set a lock screen theme under Personalize, but that doesn’t mean that you can have widgets on it or show missed calls and such on it. Edit: it looks the same way on 4.4.2/Sense 5.5. Edit 2: but not in Sense 6
This is both a list of what htc lists and what I’ve discovered myself in the update, perhaps haven’t found all bits yet. But, Let Me Know if you find something that I haven’t listed.