loads of stuff I want to see added
1. Arcane pet merging - Merges 2 pets together to combine the appearance and mix skills/stats up between the 2, creating a completely unique pet. If anyone has played Jade Cocoon, a system like that is what I'd like to see.
2. Pet battle instances - Think like Pokemon gyms with some trash trainers and a boss. These could reward battle stones and other pet items (possibly pet battle gear?).
3. More customisation - some pet battle gear/gems/items and another ability slot would add lots more depth and make your pets feel more unique.
4. Mono-type challenges - Beating a challenge with pets of only the same type for example all beasts, this could be done with achievements, instances or a mix of both. The rewards could be titles, pets and xmog gear to match the type of pets you used for the challenge.
5. More unique skills - Some pets deserve their own unique skills/spells that no other pets has to make them stand out more and make that pet feel a bit more special when you own one.
6. More pets - obviously.
7. More levels - ^