If it’s true that Apple CEO Steve Jobs personally monitors the list of employees who have permission to take pre-release versions of the company’s products off campus, he might want to raise his standards for inclusion a bit. Because the company seems to have lost yet another next-generation iPhone prototype.

Photos of the intact device and a teardown were posted to the Vietnamese forum, Taoviet, yesterday, and they look genuine, though obviously, there’s no way of knowing for sure.

The prototype is nearly identical to the one lost in a German ale house and subsequently purchased by Gizmodo, though it’s a bit more polished. It features the same iPad-esque glass and aluminum design and a chip with an “APL0398″ designation–the same one found on the iPad’s A4 system-on-chip. It lacks the two screws so prominent on the Gizmodo device, which suggests it may be a near-final production model.

Again, there’s no way to be certain. But I imagine we’ll find out for sure during Apple’s (AAPL) Worldwide Developers Conference keynote address, the traditional venue for introducing new iPhones.

Below, photos and video of the device.

[Image/video credit: Taoviet.nv]

“…We believe Apple will focus on the new version of Mac OS X, Snow Leopard at WWDC,” Munster writes. “While some investors may be expecting Apple to launch redesigned iPhones at WWDC, we do not anticipate the launch in early June. Rather, we expect Apple to host a special event in late June or early July to launch a family of iPhones. We continue to expect multiple models, possibly a high-end iPhone with improved specs from the current version and a low-end version with lower capacity and fewer features along with a reduced pricing plan. Such a model could also be used in Apple’s launch of the iPhone into China as soon as the end of summer ’09.”

Munster’s is an … ahem … interesting theory. But remember, now that it has withdrawn from Macworld, WWDC is Apple’s biggest event of the year. Surely it wouldn’t pass up the opportunity to debut the latest iPhone there–especially when Palm (PALM) is expected to announce its new Pre handset on June 5, just three days before the WWDC keynote. And if the latest update of the device is as modest as some reports claim, there’s no need for Jobs to be on hand to announce it. It’s not a milestone product, and Schiller could easily handle it. Then the company could plan the late June/early July event to which Munster refers around that media tablet Apple’s rumored to be developing–with Jobs presiding, of course.

UPDATE: Over at Daring Fireball, John Gruber notes that if the next generation iPhone includes updated hardware, Apple will almost certainly announce it at WWDC. Why? Says Gruber, “…If there are any new hardware features — like say a video camera or magnetometer — that means new APIs, and if Apple wants to have WWDC sessions for the new hardware-specific APIs, they have to announce the hardware first.”