Got my Encores today as well. First thought, I think I like my K10u's better!
Second thought, after a couple of hours, they sound excellent, not an improvement on the K10u's IMHO, just a different take on the signature. Not as bass heavy, granted, but just as engaging.
Reminds me of the difference between the original LCD-2 and the current LCD-2. Both are great headphones, but the original had quite a take on the bottom end.
The K10u will always have a place in my collection.
Throwing in one my into the mix, I also have the K10 customs from last year, and find them bass lighter (not light) than the K10u. The K10u's are from the second year of production.
From the first few hours of usage, the Encores remind me of an improved version of the K10 customs.
My .02$