So, as a guy that sees quite a few pallets of 2500lbs+ of LiOn, this subject keeps me awake over the oceans thousands of miles from anywhere.
My wife knew the FO on the UPS jet fairly well too, so that brings it a bit closer to home as well.
I've kicked pallets off due to damages boxes with LiOn. I had high hopes for this new UPS-designed & tested ULD. However, like @DE727 said, as long as we only kill 3-4 at a time (Don't forget Asiana lost a 744 freighter MONTHS after UPS for the same reason.). We won't see progress, much like the part 117 carve out.
Just like I'm safe to fly a 747 over YOUR house with a rest cycle that flies in the face of science a day after I flew a 747 over your house with the new rest rules, LiOn is not required to be labeled as Haz even though approximately ONE HULL LOSS OCCURS EVERY TEN MONTHS.
[sarcasm]At least LiOn fires are self-oxidizing. [/sarcasm]