Ihcoyc,
Thanks for the link. As you say it may turn out to be a comet or other non-planetary object. These finds do occur every so often and Astrologers spend some time debating whether or not to treat them as worthy of inclusion in ephmerides or chart work.
I think (though AG is likely to know more than me) that the last real attempt to include a new 'planet' was Chiron - which is still used by many Astrologers, though I think it is now accepted to be more of the asteroid/comet type object.
An interesting comment that I noted from the Guardian is:
"Quaoar definitely hurts the case for Pluto being a planet," said Mike Brown, associate planetary science professor at the California Institute of Technology in Pasadena. "If Pluto were discovered today, no one would even consider calling it a planet because it's clearly a Kuiper belt object."
http://www.guardian.co.uk/international/story/0,3604,806694,00.html
Now if Astronomers decide that Pluto is not a planet, what effect if any will there be for Astrology and are all those charts with Pluto in the wrong?
Personally I think that Pluto's role in the horoscope will not be questioned seriously as a number of Astrologers also use the larger Asteroids and other bodies in their analyses (I wouldn't dare try at my stage of development).
It will be interesting to see what effect this find has on the Astrological community and what they feel about the nature of this 'new planet'
Minderwiz