New submitter casab1anca writes "In classic Amazon fashion, without much fanfare, a bunch of new tablets just popped up on their homepage today. The new range, dubbed HDX, is available in the usual 8.9" and 7" versions, with improved hardware and software, but perhaps equally interesting is the revamped 7" Fire HD from last year, which goes for just $139 now." Compared to the Kindle Fire HD, the new models feature a jump in display density (216 PPI to 323 PPI for the 7" and 254 to 339 PPI for the 9"), a switch from a dual-core TI OMAP Cortex-A9 (at 1.2/1.5GHz) to a quad-core 2.2GHz Qualcomm Snapdragon, and a bump from 1G to 2G of RAM. On the software side, Android has been upgraded from 4.0 to 4.2.2 and Amazon added a few new features to their applications. Businessweek has an interview with Jeff Bezos running today too (starting a bit down the first page).