I know they've made new rules about rotational falls. I'm not sure of the particulars, but if you and your mount have one you are banned from competing for a certain amount of time (3 or 6 months, maybe) presumably so the horse can rest and heal before re-entering competition.
As a non-competitor, it sounds like a fair rule to me. It might prevent needless death and injuries of horses and riders. The USEA has tried like heck to keep photos and videos of horse crashes out of the media, but I've seen still photos of both Kentucky Rolex crashes and they are horrific. You can tell immediately that the horses do not survive and that the gates are too risky even for elite athletes.
Something needs to be done to keep the sport exciting and growing in popularity with out killing off all it's stars--human and equine.
Frodo was the second horse in less than a year to die under the ridership of Laine Ashker. Last year Eight St. James Place collapsed and died at the finish line of the Jersey Fresh event in June 2007.