The new XPac, Battle for Azeroth, drops on August 13/14, 2018. Those planning on returning to Wow Alliance will probably want to get your Intra-Guild posts and in-game invites done before then, so you will be ready to play. You can post your request here: https://forums.oldtimersguild.com/t/world-of-warcraft-alliance-intra-guild-invites/116/60.
We already have some of the new content, including four of the new races, two for each faction. So there is plenty to do in the meantime.
Hope to see you soon! Happy Gaming!