A few things I personally want to see on Wyvern.
OP-Factions
Though the server wasn't as popular as Factions was, the server was really fun to play on, though it'd be near impossible to replicate what it once was due to others moving on from MC, it would be more of a nostalgic thing as well as a cool server to play whilst factions dies out towards the end of a map.
Ranks
Definitely been suggested on this thread, but with this now being Wyvern, it would be logical to have ranks match the server's brand,
Frequent events?
Events would be an amazing way to increase interaction with players, adding events that aren't in favour to specific audiences. (PvP, Building etc). Potentially add events that are fun for all? if not, scheduled events for specific audiences. (PvPers, Builders, Riaders etc)