The itinerary designer for the BizTalk ESB Toolkit is now part of the BizTalk Server installation media.
After installing everything if you find 'BizTalk ESB Itinerary Designer' template is still missing from VS
To resolve the issue, please try running: devenv.exe /setup
(in a command lind of VS2012 directory)
(in a command lind of VS2012 directory)