If it's not backwards compatible, it's going to have a hard time gaining any traction in today’s market, IMHO. There are too many devices that have WiFi built-in, and if they can't connect to this new version, then a lot of people aren't going to buy it.
Lets see, we have WiFi in digital cameras, video cameras, PDAs, wirless home phones, mobile phones, laptops, ...What else am I missing?
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