Should we push just asdf-3.2 or also uiop-3.2 (since the new XDG functions are properly UIOP)?
(I assume you mean *features*) Actually, I don't think there's anything new asdf that warrants a feature, so I'd add a uiop feature only (and uiop has evolved enough since 2.27 that a feature could help, especially considering that at least quicklisp distributes uiop without asdf). I believe uiop/driver.lisp is the correct place for the pushnew.
—♯ƒ • François-René ÐVB Rideau •Reflection&Cybernethics• http://fare.tunes.org Live as if you were living already for the second time and as if you had acted the first time as wrongly as you are about to act now! — Viktor Frankl, "Man's Search for Meaning"