The devs said if there will be flying mounts, they'll appear in the endgame. Being realistic, I prefer a mount who can glide with their wings (like a ladybug/ladybird) at the moment.
In the roadmap they talk about megabosses, since G1 I want a bird boss fight (like a dragon fight) but there are things more usefully before that.
Basics raids aren't a problem, let's see the new raids mechanic's first
Taming worker ants will be nice, but grinding basics resources aren't difficult, and they have work to do in their colonies :S