I strongly doubt that at this point in time. There haven't been any
mentions on any of the websites I normally frequent.
Consider. You have a band and record a session. This is *your* music,
no one elses. For M$ to change this file *without* your permission,
adding limits to what can be done with it, puts Media Player (as far
as I'm concerned) in the category of being a Trojan. They will have
decided how you may distribute it and to whom.
Don't worry. There's enough s**t coming down the pike from M$ to
satisfy any feelings of paranoia you (or I) may have.
Here's an interesting one you may like (I'm still looking for official
confirmation):
http://www.theregister.com/2004/06/23/beastie_boy_cd_virus/