Calling it "telepathy" is definitely wrong. I'm not sure what it should be called, but definitely not that. The word already has too many different connotations.
We've already had this one too:
http://lesswrong.com/lw/318/conjoined_twins_who_share_a_brainexperience/
Downvoted because it was linked here a few days ago. (Someone said this already, I know, I just prefer to explain the rating.)
http://www2.macleans.ca/2010/11/02/a-piece-of-their-mind/print/
To be fair, it's a very special case. But I think the scientific opportunity here is *incredible.*