@LazySigh: Will there be PvP? (Source)
DeeJ: Yup! We’re already thumping each other’s skulls in studio-wide playtests, battling other Guardians for glory, bragging rights, and rewards. All the gear you earn in competitive multiplayer can be taken into other modes, too (and vice versa)!
@jaydawg6958: I like to play games solo often. How much can I do alone? (Source)
DeeJ: Ah, the proverbial Lone Wolf. You can experience Destiny’s story as a party of one, assuming you’re that much of a badass. Destiny will never require you to team up with other people in campaign missions. You’ll see other players along the way, but you can choose to ignore them. That said, we think you’ll find that playing with other Guardians is quick, painless, and a ton of fun. It’s always your choice, though.
@jaydawg6958: How deep does the customization go? (Source)
DeeJ: All the way down to your bones! Well, maybe not that far, but Destiny will be what you make of it.
All of the weapons and gear you can earn in Destiny can be customized — some more than others, but the goal is to let every player tell a story through the gear and abilities they’ve earned and wear. You create a character, pick a class, gender, and race, and then you customize the way you look and fight by completing missions, defeating enemies, or maybe just by exploring the world.