The Xubuntu team member is asked to vote again Xubuntu 15.10 plans to drop GIMP, Abiword and Gnumeric and include LibreOffice by default.
The vote initiated last week and get expired yesterday. The Xubuntu Project leader, Simon Steinbeib announced the results. As of the vote results, for Xubuntu 15.10 GIMP and Abiword will be dropped, and shipping LibreOffice by default.
One of many reason to vote again GIMP is that this app require so much space in ISO. Altough not shipped by default, you can still install GIMP on Xubuntu with manual install or with Software Center.