BDXL is mostly aimed at commercial sectors, such as broadcasting or medical and document imaging enterprises that need high-capacity discs for archiving purposes. It provides 100GB or 128GB write-once options, while rewritable solutions peak at 100GB. A mainstream version of BDXL is also in the pipeline for regions with high BD recorder consumption.
IH-BD discs aren't quite as capacious as BDXL, but they're an interesting development nonetheless. The discs implement a single BD-ROM layer and a single BD-RE layer to protect users from overwriting critical data, while still remaining flexible. All of that's fine and dandy, but there is some bad news: you'll need new hardware to play back or record BDXL or IH-BD media.