Amazon will launch a 9-inch Amazon Kindle Fire tablet, as well as a refreshed 7-inch model by the middle of this year, according to one analyst’s forecast.

Chad Bartley of Pacific Crest has increased his Kindle Fire 2012 sales estimate from 12 million units to 14.9 miilion units, partly due to the expected new models.

A 9-inch Kindle Fire model would perhaps allow Amazon to take on larger tablets like the iPad, having already cornered the mid-sized market with its exceptionally-good-value, 9, 7-inch Android offering.

Amazon has tasted success with the Kindle Fire. While it might not be the iPad-killer some predicted it would be, it has handily secured the number two spot in the tablet market.