The Kindle Fire 2 is now a part of the 7" Kindle Fire HD forum.
In terms of software, the Kindle Fire 2 is much closer to the 7" Kindle Fire HD than the original Kindle Fire. The two are similarly equipped with locked bootloaders, run ICS and share the same rooting method. Consequently, the KF2 has now been made a part of this 7" KF HD forum.
I just got a Kindle Fire HD as gift for Christmas. I somehow prefer it over the Nexus 7 because of the sound and screen quality. But one little problem with the Kindle Fire HD is that unlike Windows, Linux doesnt auto-recognize it.