Let\'s start from the beginning then...
Stats:
Your stats will have an effect on how attacking/magic works, as they\'re included in the damage calculations. Yay for that. (CB)
Shops:
Ingame shops are available. (CB) Merchant mode might be available too, if it\'s done. (CB / Post-CB)
Prices:
Very... very expensive. Just look at the example on the planeshift.it site. A farmer\'s monthly salary: 250 trias. A good steel sword: 350 trias. Those numbers aren\'t set in stone, but it definitely wont be cheap.
Buildings:
Er.. What about them?
Loot:
A shot in the fog from acraig (this isn\'t really his department): Money/Weapons/Potions. There might be more stuff added before CB is released, or some of those things might not be added at all. It\'s not for sure.
Skills:
You\'ll gain experience from fighting, and it will be used in improving your fighting skills. (CB) I can\'t really be more detailed as that\'s all I know. But the above is for sure.

\"
The skill system will be based on both training and knowledge and experience, not sure how complicated the first version will be but the plans are that just beating crap up is not enough\" - Andrew \"acraig\" Craig
About the Crystals -> Tria exchange:
No idea. This is still not decided. Try and see if you can figure out anything from this thread -
CB Economy Monsters & Combat:
Well, if you look at the movie, there are 4 of them, and I bet that\'s just a taster. As for the combat. Well, in CB it\'s mostly about targetting your enemy and then attack until either of you die.
PvPing:
Just added this because I know something. Heh...
Duels and Guild Wars should work in CB. It works where you challenge a player/guild, and then you kill eachother. There might be arena areas, but that\'s not for sure. I couldn\'t really figure out how far they had come on that part.
I think that\'s just about all the things you asked about, isn\'t it?
Edit: I asked acraig to come and correct me if I\'m wrong about something. No idea if he\'s going to do it, though.