Although the debate has yet to be finalised, it seems likely that Pluto (and Xena) will be planets number 9 and 10, based on the fact that they orbit the Sun, have sufficient gravity to be spherical, and are above an absolute magnitude filter.
see:
http://astro.cas.cz/nuncius/nsiii_02.pdf
and maybe we will get planets numbers 11, 12, 13, 14 and 15 using the same definition. (Charon, Ceres, Vesta, Pallas, KBO EL61)!!!!
Of course, this is not really astronomical science - the people who study these objects probably don't care whether they are planets, minor planets, planetismals, KBO, TNO, asteroids, or whatever you call them does not alter their physcial characteristics. Just as there are no boring galelian moons there is undoubtedly no boring KBO's, I suspect they will all be very different. The close up spacecraft views we have of asteroids and comets so far captured would indicate an intrigueing diversity of surface features.
waste of time really - just call them all minor planets