My wife just got a Kindle (plain ol' non-3G non-touch) yesterday and I was amazed at how light and small it is. It made me realize just how heavy the Fire is compared to the newer e-ink devices.
That said, at about 14 oz, the Fire is on par with a thick paperback book and less than a hardcover. It's also on par with other 7" tablet devices (only the Nook Tablet is lighter, and only just by a little) and the Fire is significantly lighter than say an iPad 2. The Fire is about the same weight as my older Kindle 2 with leather cover, so for me the transition is not even noticeable.
As for the question about whether there will be a "Fire 3G" I think there absolutely will be, but it will be both more expensive and require a data fee. The only reason that the e-ink Kindles don't require a data fee is because they don't really use much data; nobody really browses on them, at the most people might spend a little time on wikipedia researching something they read in a book. The Fire is a very Internet-centric device, and Amazon would have to charge a data fee for people to download video, stream music, or browse the web.
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