I'm surprised how little factual information has been released about this incident, especially given the history of problems with the Trent on the 787. The only photo of the affected engine I could find had a large advertising board placed in front of it to try to prevent photos of the damage. Normally, by this stage, we would have seen photos of the damaged engine, know the variant of the engine, the number of cycles and hours it had done, and have some idea about what part of the engine had failed, even if the cause is still to be determined.
Twitter had this amusing observation;
As avgeeks like @janlisiecki most likely know: BOEING = Bits Of Engines In Neighbor‘s Garden