At the start of the year, we saw a quad-core smartphone from LG leak, which went by the name of the LG X3. It now seems to have had an official launch, with a new name. That name is the LG Optimus 4X HD.Yes, another MWC launch that LG has chosen to unleash before the event proper. Not a bad move, as it means the launch doesn't get lost in the crowd. Saying that, this isn't the kind of phone that would get lost in the pack. The Optimus 4X HD is a premium piece of kit.'LG introduced the world's first dual-core smartphone exactly one year ago and today we're announcing the next milestone,' said Dr. Jong-seok Park, president and CEO of LG Mobile Communications Company. 'But speed in itself isn't what makes LG Optimus 4X HD unique, it's the benefit we're bringing to customers with the HD multimedia experience in a mobile form factor.'You'll get that 'HD multimedia experience' via a 4.7-inch (1280x720) True HD IPS display, assisted by the Nvidia Tegra 3 1.5GHz quad-core processor and 1GB of RAM. There's also 16GB of storage, a 2150mAh battery, an eight-megapixel BSI (Backside Illumination) camera with LED flash, a 1.3-megapixel networking camera and Android 4.0 Ice Cream Sandwich from launch. All of that in a phone with a depth of just 8.9mm.Going back to that processor, the Tegra 3 processor is the world`s only '4-PLUS-1' quad-core mobile processor, packing a fifth battery-saver core to handle less demanding tasks such as active standby and music playback. When running at full speed, the 12-core graphics processing unit (GPU) in Tegra 3 offers up a 'visually rich experience' and 'console-quality game playability'. Impressive visuals, without question.Not much is known about its launch, apart from it being Europe-bound from the second quarter of 2012. it will be getting showcased as MWC though, so expect more on the Optimus 4X HD next week.