I also was there last week and was somewhat confused when Disney switched EMH park days on us! However, we WERE told at check-in and in the literature about the change and everything worked out just fine.
BTW, by using Fastpass and doing the EMH/switch to another park routine, we managed to avoid nearly ALL lines. Because we didn't feel we needed to go to Epcot's EMH, we went to MGM on Wed. morning and rode RNR FOUR times in a row and TT once in an hour's time. We also saw Indiana Jones with no wait whatsoever (just walked in at show time). We had similar experiences at other parks (though Wed. night at MK was a different story!). I had to admit that the rumours about park attendance being down seemed to be true this past week. We always go during this week and have never had such good luck with the crowds.
Took