Dave,

Nothing is in concrete yet. Until I have built and flown the glider to test the different control system ideas (spoilers vs. tailerons or combination of the two) I am not sure exactly which method I will use to control this sucker.
Slats would be nice, but with all of the other challenges associated with this airplane ( i.e. very complicated scale gear, full span flaps in a very thin wing) I think I will avoid making it even more complex than it needs to be.