http://hdguru.com/panasonic-drops-in-new-value-4k-tv-lines-adds-retailers/
The black bezel CX400 models include the 50-inch TC-50CX400 ($799.99 suggested retail), which will have a native 60Hz refresh rate (120Hz effective); the 55-inch TC-55CX400U ($999.99), which will have a native 120Hz refresh rate for smooth motion images and the 65-inch TC-65CX400U ($1,499.99), which also will have a native 120Hz refresh rate.
The matte silver CX420 models include the 55-inch TC-55CX420U ($999.99), with a 120Hz native refresh rate; and the 65-inch TC-65CX420U ($1,499.99), with a native 120Hz refresh rate for smooth motion images. Note that prices listed on the Panasonic shop website as this was posted were showing slightly higher. The sets will go on sale in stores in December.
All of the new CX400 and CX420 models have direct-lit LED LCD panels with native 3840×2160 pixel resolution. Interestingly, Panasonic said that the sets were designed with pre-optimized default settings "eliminating the need to spend time calibrating picture color gamut, white balance or anything else."