I'm hoping fishing is going to be a minigame, or even a process:
1. fish
2. cutting/prepping
3. taxonomy/cooking/trophy making
4. eat/decorate
This would be especially cool if one of the unnamed two masteries are player housing. And it might elude to (public) boat housing too, that'd be extraordinary, though its just me being overly positive.
Coz then fish can be used in the rest of GW2 features; home instances, gold trading, chair and toy item (collection/crafting), Guild halls, cooking/crafting, and (hopefully) boat housing.
LA, Crystal Oasis, some guild halls, gots tons of space in terms of bodies of water, if they were summoned and 'dismounted' like mounts but have collision, that'd be pretty sweet. Maybe even have an instanced port in Cantha to customize the boathouse and decorating works like Guild Hall decorations.
Geez, I'm being too positive about all this so don't take this post too seriously (but devs do hit me up if ya'll like the idea assuming you got staff prowling the forums)