Although EASA's certification calls for 370 minutes ETOPS from the outset, the U.S. Federal Aviation Administration (FAA) will take a few months longer to consider the same level of clearance.
FAA has started A350 ETOPS certification from 180 minutes. US Airways and Delta Airlines are both A350 customers but deliveries will not come until 2017.
Check here the FAA certification approval update.
Literally, the statement is:
The type-design reliability and performance of the A350-941 has been evaluated in accordance with 14 CFR 25.1535 and found suitable for 180-minute maximum diversion time extended operations (ETOPS) when the configuration, maintenance, and procedures standard contained in Airbus document reference, “XWB/FAA: 14 CFR 25.1535/CMP” are met. This finding does not constitute approval to conduct ETOPS.