My understanding of the A330 is that the cabin altitude varies between 7-8K feet depending on flight duration. The 787 is supposed to be around 6K. What's the point of your question?
They actually are normally below 6000 ft on longer flights. On short sectors the diff is decreased with a higher altitude however the benefits of a lower cabin altitude are not there on short sectors. The lower cabin altitudes that Boeing refer to was against their other products like you fly.
Likewise with the increased cabin humidity, it has been available for some time. Air Mauritius was the first airline to have it in service on their A340s, it is now available on just about everything from 737/A320s jets to 777s. It is not unique to the 787.