My (european) Diners has the traditional 14 digits number starting with 36.
The MasterCard logo is on the reverse side together with the text : "In US/Canada this Diners Club Card is accepted at MasterCard locations" .
In Europe the card accepted only on the Diners Club network.
What I read in the press about the Discover deal means, that Discover cards should be accepted in the future on the Diners network. I don't think that Discover will be offered in Europe, there is not really a market for it.