Apple’s reveal of iPhone OS 3.0 earlier this week on St. Patrick’s Day gave a peek at all the excitement that’s headed to all current iPhone and iPod Touch users this summer.

Of course, the internet being what it is, there are already copies of the new software floating around, as the new OS was released to registered developers for testing. Though not official approved developers, the iPhone hacking dev-team behind the jailbreaking and unlocking of the popular Apple devices chimed in to confirm that ‘aftermarket’ apps will still be possible under the upcoming software.

As noted in a post from the dev-team blog, “yes the 3.0 OS is jailbreakable on all devices.”

The statement does come with a warning, however, as the new baseband update that comes with 3.0 is currently invulnerable against the ‘yellowsn0w’ app that unlocks the iPhone 3G. In other words, don’t even think about tinkering with 3.0 if you rely on an unlocked phone.

Those with the older iPhone 2G (EDGE) models have less to worry about, as developers who have updated to the early 3.0 build found that their unlocks still held true under the new OS.

While many of the best jailbroken apps are made obsolete by the built-in features promised in OS 3.0, there’s always going to be a demand for iPhone functionality that’s not allowed on the App Store.

Perhaps the most interesting news of all is that the dev-team seems to already be working on a jailbreaking “pwnage” solution for this early 3.0 software. The dev-team recommends that iPhone 3G users “show some restraint and wait for PwnageTool to create a custom IPSW that avoids the baseband update.”

Of course, Apple still has a lot of time to block jailbreaking in new builds of 3.0, but it seems that adventurous iPhone 3G users who aren’t afraid of running sketchy software could get access to an unlockable version of the OS soon.