Despite the slow sales of Blu-ray writers at present, according to Pocket-lint LG has just announced its 4x Blu-ray disc writer, which it claims to be the world's fastest Blu-ray writer this time.  It also features up to 12x writing to DVD±R and 8x/10x writing to CD-R/RW respectively.  Unfortunately, according to this article on Channel Register and this earlier DigiTimes report, the drive does not support dual-layer Blu-ray recording for either BD-R or BD-R formats.

source: 'blu-ray-technology.com'