What's New in GNS3 1.2

GNS3 1.2 version has released on 20th November 2014, and they have introduced so many new features like:
  • New VirtualBox support.
  • New GUI styles: charcoal (default) & classic. Changing GUI Preferences.
  • Integration of GNS3 converter (allows old .net topologies to be opened).
  • VirtualBox linked clones support (experimental, still some problems with temporary projects).
  • Allow Qemu VM to have no interface.
  • Option to allow console connections to any local IP address when using the local server.
  • Automatically extract IOS configs when a project is closed.
  • Show the cancel button in Wizards on Mac OS X.
  • Fix crash on Windows 32-bit.
  • Fix “new project” bug when using the GNS3 IOU VM.
  • Fix “could not find unused port” WinError 10013 bug qemu-system-i386 is the new default on 32-bit platforms.
  • Option to deactivate the new project dialog at startup.
  • Add “open a project” and “recent projects” buttons to the new project dialog.
  • New host node (cloud with all available Ethernet & TAP interfaces added).
  • Fix platform detection issue with some Cisco IOS image file name.
  • Add delay (default 500 ms) when Console to all nodes.
  • Check for duplicate node names in Preferences.
  • Fix bug when editing a Qemu VM configured to run on a remote server.
  • News dock widget is smaller.
  • Add detection of qemu and qemu.exe binaries.
  • New Telnet server for VirtualBox.
  • Fix SecureCRT issue when disconnecting from an IOU device on Windows.
  • Update VPCS to version 0.6 in the all-in-one installer.
From Source: GNS Community
A copy of GNS3 1.2 for Windows can be download from this link (source 1)