Version 3 is only going to include these things at the moment:
Version 3 wont be out for a month or so, but here is what you can expect:
1 - Pets evolve as their level increases - 3 stages in evolution.
2 - More detailed stats including Speed, Stamina etc. (this will be shown on a seperate page or in the members profile).
3 - The ability for members to select wether or not they want to view pet stats (same as if they want to view signatures or not).
And yes, it wont be untl february half term, which is the only time I have for hacking due to college work.
The other ideas are all being thought about for the future after version 3, version 3 was going to be my target, but as people have shown so much interest in additional features I am going to try my best to add them!
The kind of things I was thinking of being able to buy for your pets would be toys, food, a more spacious basket // cage // bowl... I havent really thought about it, if you want to suggest some feel free