I have a Cannon Rebel XTi. I'm not sure if Cannon has released a series of EVIL (Electronic Viewfinder, Interchangeable Lens) cameras yet, but if not it's inevitable given their comeuppance in the market.
I am wondering if the lenses I own for my XTi will be interchangeable with an EVIL body, if I will need an adapter, or if I should be saving my pennies for new lenses?
If Canon was to release a mirrorless body and wished to support the EF/EF-S lenses on it, it would require an adapter because the registration distance will have changed. Basically, the gain with mirrorless is a thinner body, so the optical construction of current Canon lenses wouldn't work for it out of the box.