The phrase "forthcoming issue" refers to a problem or topic that will be discussed or addressed in the near future. It means that the issue is coming up soon and will be talked about or dealt with soon. Full definition
Part II, looking at the application of this to disputed issues in modern theology, to be published in forthcoming issue. (faith.org.uk)
What's on the horizon in forthcoming issues? (culturetype.com)
It is usually attributed to Monsignor Ronald Knox, and Father Edward T. Oakes quotes it in his discussion of brain and consciousness in the forthcoming issue of F IRST T HINGS: (firstthings.com)