There are two schools of thought regarding SW upgrades and consumer devices like the Kindle:
1) It's like a PC (or an iPhone), and of course customers get new software upgrades, maybe free, or maybe for a fee.
2) It's like your microwave. The new models have more features, but you have to buy the new model to get them. Note, it costs a company money to retrofit to "older" devices (develop, test, document, release), and an upgrade might cause service calls or go wrong, so why bother? Buy the new stuff.
You might assume that if Amazon had a new paid service or if a new feature will cause more books to be bought, then there is an incentive to upgrade the installed base. On the other hand, if it's support for the 5-way, then no retrofit. And then there is a gray middle ground. The sync stuff apparently made the cut. I wouldn't hold my breath for more, but you never know.
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