PalmSource Ships Palm OS 6
grndslm notes: "PalmSource has indeed shipped Palm OS 6, the next major release of its operating system, to its licensees. The company has posted a press release this morning, PalmSource CEO David Nagel will also be presenting at the Needham Growth Conference today as well."
First, the reason you don't see a "Buy it now!" or similar button is because this is not a release to the general public, but instead just to licenced developers such as Sony, Handspring, PalmOne, and Kyocera. However, as far as I know the answer to your question is "maybe." Upgrading to Palm OS 6 depends on three factors:
Hope that helps some. I would hazard a guess and say that ARM-based devices from Palm (Tungsten|T, Tungsten|C, Zire 71, etc) will be upgradable, and that Palm will provide such an upgrade, simply because they've done so in the past. Couldn't say for other Handspring or other vendors.
At the very least, the Treo series have flash memory. Of course, Jack Flash and FlashPro appear not to work with it, but I have done the flash memory upgrades they've released (the Treo 300 runs PalmOS 3.x, I believe).
This is one of the few devices I don't want the latest and greatest OS for -- this thing works (well) and I don't wanna screw with it. The *only* thing I would like to see improved is getting rid of that damned "Please Wait" crap when you flip the beast open and launch the phone app -- sometimes takes almost 20 seconds to launch it to make a call.
Then again, if that's the biggest complaint I have about a device, I'd say it's doing pretty good :)
Read my stuff.