Most of the time I'm too curious. Especially when the icons start coming :D
Your video reminded me... and then I promptly forgot again. That's a good possibility. I also hadn't heard that about David Tennant! Now I'm especially looking forward to it. Maybe they'll do something like the Five Doctors or the previous anniversary they did with the first three.
Now I really should have watched that opening. I gathered as much though since I watched several confidentials and how much fuss there was about reviving it (or whenever the Doctor or companions change)