Boeing said that they are talking to GE about getting a replacement engine for the one that failed last weekend on ZA238 (LN 54, VT-ANJ). As to impact on deliveries, Boeing is saying that no determination has been made that would impact their ability to deliver airplanes with GEnx engines.
So obviously the engine is going to be replaced but when is not yet known. Also Boeing is still trying to figure out (along with the NTSB and GE) what went wrong so they can determine the impact, if any, to deliveries of airplanes with GEnx engines. I'm presuming that this will include not just the 787 but also the 747-8. Here's a text of what Boeing sent me:
We continue to work closely with the NTSB and its party members, including GE and FAA, on the investigation. The engine will be replaced, and we're working with GE on that. Regarding deliveries, at this time, there has been no determination made that would impact our ability to deliver airplanes with GEnx engines. Of course, if at any time during the investigation it is determined that there is a need to take action, we will not hesitate to do so.