Apple has made available a new version (5.6) of the iTunes Connect Developer Guide.
This new version includes information on: ● Enabling your app for iAd rich media ads and the iAd Network module in iTunes Connect; ● New support for requesting Promotional Codes; ● Fetching crash logs on demand; ● Requirements for submitting high resolution screenshots and small icons.
You'll find the iTunes Connect Developer Guide available for download on the homepage of iTunes Connect.