It's pretty much the eve of Apple's big WWDC press conference, and Daring Fireball's John Gruber is back at the eleventh hour to chime in some more on his previous (and perhaps well-informed) iPhone predictions. He sticks to his previous wagers -- twice the CPU speed, twice the RAM, a heavy emphasis on a new video camera (no word on if there's an additional front-facing one), and $199 / $299 for the 16GB and 32GB models, respectively -- but additionally chimes in that the new device's codename is... drumroll, please... the iPhone 3GS, which he surmises is probably going to be the final product name, as well. Kind of a yawner, if you ask us, but it'd sell like gangbusters no matter what it was called. As for that lowered-tiered iPhone, he's expecting it to be the current 3G model with a price drop to $99. Also on the table is iPhone tethering, which we already know was built into OS 3.0, likely for a fee chosen by each carrier. Teasing farther into the future, he suggests "Marble," codename for an OS X visual overhaul, and the tablet are very much real projects but that there's little to no chance it'll be at WWDC. No clue what the "S" stands for (speed, perhaps?), but at this point we're pretty much counting the minutes to tomrorow's keynote, and our clocks can't tick much faster.

At Apple's iPhone OS 3.0 preview event last Tuesday, Sir Scott explained that it was "working with carriers around the world" to build tethering support in. We can't say for sure what that means, but it certainly sounds like it'll be up to the operator to activate (or not) iPhone tethering when OS 3.0 is launched to the masses. Pocket-lint took the opportunity to ping both O2 and Vodafone over in the UK, though neither company seemed particularly interested in giving a solid answer. The former simply stated that it was "working [with Apple] to ensure new features, including tethering, are fully supported on O2's network," but wasn't "making any announcements yet." The latter simply proclaimed that it was "discussing the situation" but didn't have anything to confirm. To us, it sounds like both carriers will eventually allow it, but we aren't too sure they'll be doing so with no extra fees woven in.

There's not exactly a lot of details to go on here (or any, really), but AT&T Mobility CEO Ralph de la Vega has just confirmed during an interview at the Web 2.0 Summit that an AT&T-approved iPhone tethering option will indeed be available "soon." That lack of detail includes any word on pricing or, of course, an actual release date, though MacRumors is reporting separately that it's hearing the tethering capability will be built into the 2.2 firmware, which seems like at least a reasonable guess.

[Via MacRumors]