Yesterday Corega Japan announced their shiny CG-HDC4U3000 four bay enclosure that supports up to 4 2TB HDD for a total of 8TB of space (RAID0) that's connected to a PC via USB or eSATA (full speed)
Nice thing indeed, but not very new. It's been available in the Australia under a different name, the Hotway ProBox HFS2-SU2S2



http://www.akihabaranews.com/en/news-19224-Corega%27s+New+Four+Bay+Enclosure%2C+Renamed+the+Hotway+ProBox+HFS2-SU2S2.html