1) No... I saw nothing in that presentation that I don't get from either Spotify or Google Play Music.
2) I'm on the fence on this one. My wife struggles with the scourge that is iTunes on our HP laptop, so I've seen how much effort Apple puts into software that isn't running on their native platforms. The developers of the windows iTunes application need to be rounded up and tossed into the deepest, darkest hole on Earth. How good will the Android app be? It might be OK, but it certainly will not be as good as it could be. I fully expect it to lack a number of the features of the iOS app...
3) Not all that likely. The ONLY reason they are releasing an Android Apple Music app is that the app itself is revenue generating. Anyone using it will be on the hook for at least $10 a month. The other apps (like iMessage, for instance), it'll be a cold day in hell before Apple let's Android into those services... that would make it that much easier to switch from an iPhone to an Android phone. Apple needs to sell iPhones to make money so a dude using iMessage on his Galaxy S7 wouldn't make them so much as a penny.