At first I thought this would be an April Fools joke, but I guess not.
I can agree with what others have been saying so far as far as the movements and vocal inflections go, this is very much the Elmo we have grown to know and love. The voice itself is an adjustment, but I'm sure as time goes by, we'll get used to it... I remember having trouble getting used to Eric's Bert and Grover and David's Cookie at first, but after a couple of years or so, I didn't think much of it anymore, as you just have to accept these things: performers aren't going to be around forever, and therefore, new performers have to step up to the plate in order to keep the characters around forever. We got used to Steve's Kermit and Ernie, we got used to Matt's Big Bird (and will get used to his Count as well), we got used to Eric's Bert and Grover, we got used to David's Cookie, we'll get used to Ryan's Elmo. That is if he will be the new Elmo, since it seems like SW hasn't made up their minds about a permanent new performer just yet.