Hey,
So far there are no plans for mythic, things change though and a lot will change before we get to raiding as I want to discuss plans with those interested in raiding when we have the members.
I’m planning on the guild being mid-size but again things change 
depends on the interest if we end up with a lot of members theres no reason we couldn’t run multiple raid teams.
I’d be happy to discuss further if you have more questions, add me on BNET Volto#21126