You might want to call them up and ask them. (1-800-2DINERS)

They've said "in a while" or words to that effect too many times without anything having happened, it'd be a little hard to believe any new forecast especially if it still lacked a firm date. See post 3 of:
And was this change a preparation for a re-launch, or unrelated:
But, of course, even if they re-open applications for a Diners Club card again, it's not clear whether it'll specifically be the Elite card again. When they introduced it, they seemed to not realize that some of the categories it included were ripe for MSing, and they apparently got "bit" by that.