[Elecraft] What is this new back panel

[designer]

 From time to time someone mentions the "new" heat sink back panel for 
the K2. I haven't seen a picture of it on the web site or item listed 
in Options. I've suggested that Elecraft make a PSK friendly back 
panel - with holes for Line In/Out or one hole for a 5 pin DIN plug 
to handle those I/O. Wonder if this new back panel is it.

If there is a new back panel, how is it different from the previous 
model and how much does it cost?
Thanks and 73,
Paul