Granted not much is known about what's inside Fire's case but it's clearly not a challenge for, let's say, an iPad - the new Kindle doesn't even have a camera.
Ok, most Kindle users probably will not care for the hardware because the price is exceptionally good when compared to other tablets. Some Samsung's tabs have similar hardware and are much more expensive.
I have a traditional Kindle reader and in my opinion it's an awesome reader only because of the e-Ink screen. Kindle Fire sports a LCD IPS display, which is not so great for reading.
Will Kindle Fire potential buyers realize that before rushing to the e-store? Maybe the new IPS display is better than I think it is and in this case I apologize Amazon.
If you want an e-book reader and a tablet, you will probably buy the Fire.
It's not out until November but Amazon is accepting orders (last time I checked).