Just to note, this has not actually been agreed yet. The vote will take place on 24 August.
See the IAU website
here
If the resolution is passed, I will be slightly sad, as the IAU will then give 2003 UB313 a "proper" name, rather than leaving it with the unofficial name of
Xena (which they would probably do if it was not considered a planet). Still, whatever they call it, I will always call it Planet Xena and it's satellite
Gabrielle