Since the new program has been announced, there have been several changes and there are exceptions to the standard schedule occurring in each month in which park hours are published.
I think there are a couple of instances where an extra EMH day was added one week, but I wouldn't expect that the total number of EHM days in any given week will vary much from the standard schedule. Disney has already released the hours for March, which includes two of the busiest weeks of the entire year and thus far I believe the standard EMH schedule is in effect for both of these weeks.
Unfortunately, I don't know if even Disney knows for sure whether a standard schedule will eventually be followed all the time or whether there will continue to be exceptions - if you call 407WDWINFO multiple times, you may even get multiple stories as to what the current schedule really is.