On 2014-02-16, I downloaded the Gateway-7 image, adrelanos.asc key, and the .ova.asc signature using the download links on the Whonix wiki page.
Attempted to verify the image using gpg4win which I downloaded just before the gateway image (I did read the some of the wiki).
The key is dated 2014-02-16, gpg4win said the gateway image was signed 2013-10-10 by an unavailable public certificate.
At about 0630 UTC 2014-02-18, I downloaded the signature again hoping that it had been updated; no joy.
Are the signatures incorrect for the version 7 images or an I doing something wrong? And yes, I understand the problems with Windows - just wanted to try out the software. If it works for me, it will be hosted on Solaris or Linux.