nobody can tell ... FCP-X isn't avail yet, those who have it signed an NDA, the others, like me, just saw the sneak-preview at SuperMeet ...
what I can tell, as an FC/e3+4 and iMovie a/b-user, from that 1st look:
from ground new, totally different User Interface, totally different concept compared to any existing NLE (Avid, Premiere, FinalCut ...)
to get an impression about skimming bubbles, magnetic timelines, key-wording etc. use iMovie11 ...-