After a return season that coasted on the nostalgic joy of bringing these memorable characters back together for episodic stories that reminded of the original by boasting gimmicky but affable cameo appearances from a whole slew of former favorites — with only occasional nods to the social relevance that had served as its new “raison d’ętre” — Will & Grace settles into the second year of its revival by resuming the storytelling that had sustained it for most of its initial run.