Staff of Chinese forumWeiPhone.com [Google translation] (via MacRumors) shows what appears to be not yet working links to the new software that will showcased at WWDC. The site was able to leak this same software links last year correctly, so we’re taking these links seriously.
Besides the beta build of 10A5316k, we’re also noting that there are no links to builds of the original iPad, perhaps signaling that Apple will not support the device.
Also of interest: Apple still sells the iPhone 3GS even though it has an older processor (Samsung) than the original iPad (A4) and it appears that they will support it. It also appears that only the latest (4th Generation) iPod touch is supported even though the 3rd generation iPod touch had a slightly faster processor than the supported iPhone 3GS.
Note the links below say expired, not incorrect URL, adding credibility to the source.