It's been confirmed that the map artist for The World of Ice and Fire is Michael Gellatly. Gellatly has set up a new website and posted some teaser images for his work on World, though only bits of maps or heavily obscured images for copyright reasons.
Copyright Michael Gellatly
We're still hearing that The World of Ice and Fire may be released in April or May of 2014 to tie in with the fourth season of Game of Thrones. However, until this is confirmed the official date remains November 2014.