Preliminary conclusions are that a strut from a third-party supplier (unnamed) snapped well below certified load, causing a helium tank to roll around all over the place and eventually rupture the second stage LOX tank. Wouldn't want to be that supplier right now.
One kind of cool outcome - they determined that the Dragon capsule itself survived and could have been saved entirely if the software program had been written to deploy the parachutes upon rocket failure. They're building that in so that, in the future, it should be able to save itself if this were to happen again.
They're not committing to any particular time frame, but launches could resume as early as September.
http://www.theverge.com/2015/7/20/90...ause-explained