Evidently a one million-to-one isn't contrast ratio, as sported by the 47LG90 LCD TV isn't enough for LG because it has just announced a plasma TV with a billion-to-one figure. Yes, these numbers really are getting silly now.
In addition to this 50in billion-to-one plasma, called the 50PQ60D there is a 42in model (the 42PQ60D) which boasts a 600Hz refresh rate - or to put in another way the input 50Hz source frames are repeated 12 times on display. Both seem more proof of concept than real product, but both are being sold in Taiwan so we can but hope the UK will get a change to indulge in due course.
The sets feature an ambient light sensor which LG says helps reduce the energy consumption by dimming the backlighting when not needed fully. Although, this will affect the contrast ratio when active. Additionally, "various high-definition formats" can be played via the TV's USB port. We can dream that mkv files are one of those supported, but that's highly unlikely in the real world.
In Korea, LG is asking two million Won (£~1,060) for the 50in TV and 1.4 million Won (~£740) for the 42in. Hopefully both the TVs and those prices will translate over to the UK!
LG (Google translated).