My interest was piqued a week or so ago by the Olympus E-M5. After a few days of research into the mirrorless category, I have dipped my toe in the water for a second-hand NEX-5N.
After a few days of shooting with it, and as far as I'm concerned, I am reasonably sure I wont have any DSLRs in 12-18 months time. If the mirrorless category keeps advancing as it has, I dont really see a reason for me to keep the large DSLR form factor at all.
But thats me, I dont do action, people, shallow-dof or low light and I'm more than comfortable with touch-screen menu-driven navigation. Its the IQ that counts and I'm happy with what I'm seeing. However I do realise that the ergonomics of a large DSLR is a necessity for some people and I must admit, shooting them side-by-side, the handling is miles ahead on my 5D2.
I'm not overly thrilled that its Sony but whichever way you look at it, they have ponied up a nice camera line with the NEX series. I would love Canon to release a mirrorless this year that could accept EF and EF-S lenses with full electronic aperture and IS. It would be great for them to release a new line of smaller lenses too for the EVILs as the compactness is a huge draw for me.
Having said that I am still waiting for the metabones EF -NEX adapter to come into stock so I can use my 17-40 and see what I can really get out of the 16MP sensor. I quite like the large lens/small body look 
As usual, its a great time to be in photography!!
)
! yet I haven't tried myself.

