You mean as with most other chipped cards so far.

A thread in the Diners Club forum:

http://www.flyertalk.com/forum/diner...-chip-pin.html

documents that Diners Club members who have gotten replacement cards recently have gotten chip cards and can request the PIN to use with the chip.

(Of course, no one in the US/Canada who doesn't already have a Diners Club card can apply for one yet. They're waiting to deal with a mountain of problems that arose in the Citi-to-BOM/Harris transitition before they start accepting new applications.)