Textron’s new Scorpion military jet, introduced in a surprise announcment today, could mean more hiring at Cessna Aircraft Co. in Wichita. But only if the Pentagon and foreign militaries respond as hoped to the heretofore secret jet. “It’s very possible, but it’s going to depend on the market demand, which right now remains to be seen,” says David Sylvestre, spokesman for Textron Inc., the parent of Cessna. The Scorpion was unveiled locally in a talk by Cessna President and CEO Scott…