1.6.0-preview (Sprint 60)

To use, simply replace your [unityProject]/Packages manifest.json file with this contents:
{
"dependencies": {
"com.unity.formats.fbxsdk": "1.6.0-preview"
},
"registry": "https://api.bintray.com/npm/unity/unity-dev"
}

Note: this will only install the fbxsdk, not the FbxExporters package.

See attachment for the binary as it can be found on bintray.com