(meteorobs) New class of meteorite discovered in Antarctica

[Leo S.]

"*A pair of meteorites discovered in Antarctica are in a class all of 
their own, a major space conference has been told. *

Studies of the extra-terrestrial rocks have revealed qualities that set 
them apart from any meteorites previously known to science."

link: http://news.bbc.co.uk/1/hi/sci/tech/7294181.stm

Any thoughts on the possible origins of these?

Regards,
Leo