What version of Gazebo will ROS Jade use?

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This kind of information can be found in REP-003 (which has just been updated):

Jade Turtle (May 2015 - May 2017)

Required Support for:

• Ubuntu Trusty (14.04)
• Ubuntu Utopic (14.10)
• Ubuntu Vivid (15.04)

Minimum Requirements:

• C++03
• Python 2.7 (Python 3.3 not required, but testing against it is recommended)
• Lisp SBCL 1.1.14
• CMake 2.8.12
• Boost 1.54

Exact or Series Requirements:

• Ogre3D 1.8.x (Trusty)
• Ogre3D 1.9.x (Other Systems)
• Gazebo 5
• PCL 1.7.x
• OpenCV 2.4.x

Buildsystem support:

• catkin: build from source, release for binary packaging, wiki documentation, continuous integration
• rosbuild: build from source

Jade will support Gazebo 5.