iPad 12.9 and iPad 10.5 can now be supported without using a Launch Screen.
I believe Xcode 8 briefly supported the iPad Pro within the xcassets file, but that support has been revoked.
However, a key has been added to the info.plist file that will allow for static images to be used.
Human Interface Guidelines:
https://developer.apple.com/ios/human-interface-guidelines/icons-and-images/launch-screen/
Apple Technical Documentation:
https://developer.apple.com/library/ios/documentation/General/Reference/InfoPlistKeyReference/Articles/iPhoneOSKeys.html#//apple_ref/doc/uid/TP40009252-SW28
Sample Code (added to info.plist)
<key>UILaunchImages</key>
<array>
<dict>
<key>UILaunchImageName</key>
<string>Burn480</string>
<key>UILaunchImageOrientation</key>
<string>Portrait</string>
<key>UILaunchImageSize</key>
<string>{320, 480}</string>
<key>UILaunchImageMinimumOSVersion</key>
<string>7.0</string>
</dict>
<dict>
<key>UILaunchImageName</key>
<string>Burn568</string>
<key>UILaunchImageOrientation</key>
<string>Portrait</string>
<key>UILaunchImageSize</key>
<string>{320, 568}</string>
<key>UILaunchImageMinimumOSVersion</key>
<string>7.0</string>
</dict>
<dict>
<key>UILaunchImageName</key>
<string>Burn667</string>
<key>UILaunchImageOrientation</key>
<string>Portrait</string>
<key>UILaunchImageSize</key>
<string>{375, 667}</string>
<key>UILaunchImageMinimumOSVersion</key>
<string>7.0</string>
</dict>
<dict>
<key>UILaunchImageName</key>
<string>Burn736</string>
<key>UILaunchImageOrientation</key>
<string>Portrait</string>
<key>UILaunchImageSize</key>
<string>{414, 736}</string>
<key>UILaunchImageMinimumOSVersion</key>
<string>7.0</string>
</dict>
<dict>
<key>UILaunchImageName</key>
<string>Burn1024</string>
<key>UILaunchImageOrientation</key>
<string>Portrait</string>
<key>UILaunchImageSize</key>
<string>{768, 1024}</string>
<key>UILaunchImageMinimumOSVersion</key>
<string>7.0</string>
</dict>
<dict>
<key>UILaunchImageName</key>
<string>Burn1112</string>
<key>UILaunchImageOrientation</key>
<string>Portrait</string>
<key>UILaunchImageSize</key>
<string>{834, 1112}</string>
<key>UILaunchImageMinimumOSVersion</key>
<string>7.0</string>
</dict>
<dict>
<key>UILaunchImageName</key>
<string>Burn1366</string>
<key>UILaunchImageOrientation</key>
<string>Portrait</string>
<key>UILaunchImageSize</key>
<string>{1024, 1366}</string>
<key>UILaunchImageMinimumOSVersion</key>
<string>7.0</string>
</dict>
</array>