I know this is an old thread but I figured I'd contribute.
I was one of the 100. I still have backups of the worlds on the realms server.
Jun 13, 2013 7:44:08 PM
I have a backup on the server from 1243 days ago 11/30/13 10:36 AM
One day on Minecraft a new button popped up for Realms and I created a world and invited a few people to check it out.
First post I made after I got the Realms button http://www.minecraftforum.net/forums/servers/minecraft-realms/780881-cant-configure-or-have-permissions
What's it take to get access? how much wait ??