@Diablo has been active today, with several replies about various issues. They’re quoted below, with the question in white, the reply in blue, and are sorted by topic for easier making to the conversation following logically plus links wiki for more infos.
Will gems give the same bonuses they did in Diablo 2?—illthegreat
No, they’re all pretty much different. Elemental damage comes from enchantments now, for instance.—Diablo
since you reworked stats to benefit all classes will gems be treated in the same manner? bc D2 gems in weapons didnt benefit casters—illthegreat
There is a “caster gem” for weapons. Potentially two depending on your build.—Diablo
Zoom. How much will we be able to zoom in D3 compared to SC2?—kiowa81
There’s no zoom feature planned beyond a slight perspective shift when engaged in conversations.—Diablo
no zoom? then why there’s zoom in first gameplay trailer? (watch 1:27-2:23)—spareribs17
We did have a zoom function back in 2008. It was removed shortly after.—Diablo
Has allowing 8 or 10 skills instead of 7 ever been seriously considered? 7 just seems so few to me…—yovargas
Of course. Everything is seriously considered.—Diablo
Restrictions are likely for when/where you can change them.—Diablo
Attending this week?s Game Developer?s Conference? Be sure to check out our career booth (#2432)—Diablo
How about you hire me for your programming team? =O—K73SK
We have openings on our jobs page. Check em out.—Diablo
We know most of this already, of course. The first question covers the only topic that remains fairly mysterious; enchant. It’s something the Mystic does to items, there are a fixed number of different enchantments, and you can (apparently) find new ones that may or may not be useful for your particular character. They’re not related to gems though, which makes the @Diablo reply kind of confusing. You can enchant an item that is or is not socketed or gem’ed, and the bonuses have no relation to each other… as far as we know.
Nothing is known about the types of bonuses enchanting adds, if they are permanent to that item, if they can be replaced or switched around, how much they cost, if they are at all random, what item types they can be used on, if the Mystic learns more as she levels up, if there are enchant recipes to be found like crafting recipes, etc. Did I mention the mysteriousness?