They've been mentioned in 3e by WotC, but not given stats, and the detail that has been given isn't anywhere near the level that was presented in 2e.
Oddly enough, one of the more overt references to them was in an FR book, 'Champions of Ruin' that presented a minor slaad lord, Bazim-Gorag, who was imprisoned on the prime material world of Toril. Bazim-Gorag was CE rather than CN, and had apparently worn thin on the patience of the primary lords of Limbo, Ssendam and Ygorl, and for the moment continued to exist entirely at their sufference. That he was bound on the prime and out of their affairs probably explains why he's still alive.
Sadly they've gotten little attention by WotC, though it's possible that they might get attention in a future book, or maybe something in Dragon magazine.