As far as the mobileme account and email addresses, it looks like the me.com domain will only continue for another year and then will go away, though it's not clear if the domain will change to icloud.com or some other thing, bt keep your personal address.
Fortunately I have not really used my me.com email and only use for syncing contacts, etc. If I will get that for free, great and then we'll just have to see what happens with the email accounts. As for the music sharing, for loewr quality, on-the-go availability, even if it has to be downloaded, well, could be decent, but the devil will be in the details so not sure I'll go there when it becomes available.
It does kind of annoy me that they are going to pull the me.com email address tho9ugh.
-- Jim