@Diablo was busy tweeting today, with replies on a variety of topics. Here are the comments made on PvP Arena, charms, and funny bugs.
Are 
charms going to be as drastic in changes as traits or are they more supplemental to them?—Scyberdragon
They’re pure core stat modifiers. +2 to Vitality and such.—Scyberdragon
Funniest bug/unintended behaviour you guys found so far?—Diablo
There have been a lot. One from a long time ago, instead of a wand shooting magic, they would shoot entire horse drawn carts.—Kernosh
Hi, do you have any plans on allowing the items, traits, skills etc. used in PvM to be swapped for a PvP build on the same character?—Diablo
No current plans for a dual spec or other quick-swap mechanic to change into a PvP build.—Nielsdue
Is there going to be a free-for-all mode in arena?—Diablo
It’s a possibility that you could set one up through a custom game, but you wouldn’t earn ‘progress’ for them.—reno
How could a wand shoot a horse drawn cart as a bug? I guess they’ve got graphics for horse drawn carts in the game, and somehow the code for that was accidentally substituted for whatever the shooting wand graphic was supposed to be?
On the issue of PvM to PvP character changeovers, that doesn’t seem like a real big deal. With respecs for skills and traits in the game, and a shared stash, it won’t be difficult to remake a character purely for the arena, once you’ve decided to repurpose them for the Arena. (With the possible problem of any BoE items that aren’t BoA.) You’ll just have to use other chars for your PvM item harvesting. In a way this takes the strategy out of building a PvP character: in D2 you had to plan it from the beginning and suffer through some PvM hardships with sub-optimal skills/stats.
I like that we keep seeing Leah fan art. Was there fan art of NPCs in D2? I don’t remember any. Does that mean that Leah’s uniquely interesting? The mystery of us knowing little about her makes her compelling? Her look is fun to draw? Or it’s just a commentary on the lack of game info and other semi-human things to artwork about in D3?
The other pic is cool for the action-intensive angle. Thankfully, not too low; do not need upskirt of male Barb. kthx.