Expect Cessna at the NBAA Convention next month to announce the Citation CJ4, a stretched version of the CJ3 with a slightly swept wing based on the Sovereign airfoil. The new aircraft, with a cabin 21 inches longer than the CJ3, will be powered by 3,400-pound-thrust Williams International FJ44-4 turbofans and will likely replace the Encore. Preliminary data includes 1,000-pound full-fuel payload, 1,840-nm NBAA IFR range, 425 ktas cruise at FL410, 3,300-foot balanced field length, and 2,710-foot landing distance at max landing weight. With a planned mtow of 16,630 pounds, Cessna will be seeking certification under FAR Part 23 commuter category rules. Avionics will be the Rockwell Collins Pro Line 21. Cessna officials declined to comment.