Following Sharp last week, TDK is the second company that announces [JP] Blu-ray discs with 100GB capacity. The discs are compatible to the new BDXL format, allowing you to store 33.4GB on each of their three layers (conventional Blu-ray hold 50GB max.).
The BRV100HCPWB1A will go on sale in Japan in September (TDK hasn’t said anything yet regarding international sales plans), quite some time after Sharp rolls out its discs (July 30). Buyers can expect the same street price as for the Sharp discs, namely $55.
TDK also provides this handy chart (I translated some parts), which explains the compatibility between BD and BDXL players/recorders and discs.