Use one parenthetical

Warning²Federal courts, Illinois courts21st and 22nd editions

A forthcoming work is cited as the published piece would be, except that the designation stands inside the date parenthetical rather than trailing it in a second one. A month, when known, goes in front of the year.¹

1. 1R. 17.3 Forthcoming Publications.
2. 2A warning: the form is usually wrong under the rule in note 1, and context can justify it.