I have also wondered why it was at an outdoor trade show a few years ago but as of yet, not released. Getting certification might be the sticking point. But I think they are trying to address issues most, including myself, have with current canisters: the weight and size of them. Being able to split the canister in half allows two people to share the weight of the canister and splitting it makes a flat surface, making it easier to put in ones pack. Good for partners or groups but no real advantage for soloist that have a present canister.
I just like the idea that companies are thinking outside of the box and coming up with new ideas.
A question though for those that have an Ursack. I have often thought that having a single attach point allows bears to mouth, pull, and move the bag (creating a tether ball effect) could possibly allow them to get better leverage on the sack, leading to a failure. Would adding a second attach/anchor point at the bottom of the sack (preventing the tether ball effect) be a improvement over the present design?