The D-850 version was already spotted on LG's website, listed with a 1440x2560 pixels QHD display. We also got an exclusive tip over the weekend that the QHD screen will flaunt a 5.5" diagonal, perhaps using the same 538ppi panel, that LG showed last summer. Since there have been no rumors on the rest of the specs, one might assume that it will sport the same Snapdragon 801 processor that the other seasonal flagships are coming with, and maybe the 13 MP OIS Plus camera that is on the G Pro 2.
A leaked graphics benchmark screenshot puts all this guesswork on the backburner, though, as the handset's Android build board is listed as MT6595, which is the tag of MediaTek's most powerful processor to date. The octa-core monster is claimed to be in the same league as Snapdragon 805. MT6595 has four powerful 2.2-2.5 GHz Cortex-A17 cores, and four 1.7 GHz Cortex-A7 ones for the everyday tasks, all paired with a fast Rogue PowerVR Series6 GPU.
If the screenshot turns out to be credible, it will be interesting to see whether LG has indeed managed to test and implement an unproven processor in the G3. It has been intermittently rumored to be developing its own ARM-based processor line, though this speculation never materialized, so we'll have to take a wait-and-see approach here. The QHD panel, however, has been mentioned by a couple of sources already, so LG might actually be the first brand-name phone maker to come up with a 1440x2560 pixels flagship phone display.