MacUser has an article that continues the recent rumors of an Apple-branded PalmOS device. According to sources Apple has gone through seven different prototypes of the device, and the latest one is similar to the Handspring Visor; it will even have the Springboard slot or something similar.
I also received an email from someone recently that noticed the PDF announcement by Palm and Adobe and mentioned that Apple's OS X operating system will have a graphics system based on PDF.
Remember that all of this is still pure speculation. The only thing known is that Steve Jobs said that Apple has been "doing a lot of work with these guys [3COM] lately".