Gymnasium? Possible of course but this is given as an example more to attract coverage in newspapers and magazines.
Airbus needs the general public to be interested in the machine. Most people are not and many will be fearful of the bigger machine - simple because they have no frame of reference for it.
When Boeing were launching the 747 some 30 years ago (hang around here for 30 secs and someone will tell you the exact date
) they said it would have very similar things.
When Airbus were launching the A330/340 they had a mock up that showed the cargo deck level cabin crew rest area as ... a temple. It was going to be capable of being set up for Moslems with an indication of the direction to Mecca or set up for Jews (hey, salesman don't care what your religion is as long as they can sell you something).
As far as I know, no 330/340 has the crew rest as anything other than crew rest. But just think how nice it is to talk about things other than how many seats they can cram in and how much money everyone is going to make!