The Ju-88 was never really replaced. It was supposed to be the replacement and yes it was better in performance. Only about 1036 were built however.
Type: Bomber (D-2 Reconnaissance)
Origin: Junkers Flugzeug und Motorenwerke AG
Models: Ju 188A, D and E series
Crew: Five
First Flight:
Ju 88B-0: Early 1940
Ju 88V27: September 1941
Ju 188V1: December 1941
Ju 188E-1: March 1942
Final Delivery: 1945-46 (French built)
Number Produced: 1,100
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Engine:
Ju 188A Ju 188D:
Model: Junkers Jumo 213A
Type: 12-Cylinder inverted liquid cooled vee
Number: Two Horsepower: 1,776 hp
Ju 188E:
Model: BMW 801G-2
Type: 18-Cylinder two-row radials
Number: Two Horsepower: 1,700 hp
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Dimensions:
Wing span: 72 ft. 2 in. (22m)
Length: 49 ft. 1 in. (14.96m)
Height: 14 ft. 7 in. (4.44m)
Wing Surface Area: 602.80 sq. ft.
Weights:
Empty:
Ju 188E-1: 21,825 lb. (9900 kg)
Loaded:
Ju 188A D: 33,730 lb. (15,300 kg)
Ju 188E-1: 31,967 lb. (14,500 kg)
Performance:
Maximum Speed:
Ju 188A: 325 mph at 20,500 ft. (6250m)
Ju 188D: 350 mph at 27,000 ft. (8235m)
Ju 188E: 310 mph at 19,685 ft. (6000m)
Initial Climb: N/A
Service Ceiling:
Ju 188A: 33,000 ft. (10,060m)
Ju 188D: 36,090 ft. (11,000m)
Ju 188A: 31,170 ft. (9500m)
Range with 3,300 lb. (1500kg) bomb load:
Ju 188A E: 1,360 miles (2160 km)
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Armament: Typical.
One 20mm MG 151/20 cannon in nose.
One 13mm MG 131 machine gun in dorsal turret.
One 13mm MG 131 machine gun manually aimed from rear dorsal position.
One 13mm MG 131 machine gun or
twin 7.92mm MG 81 machine gun manually aimed from rear ventral position.
Payload: Typical.
6,614 lb. (3000kg) of bombs internally or two 2,200 lb. (1000kg) torpedos under inner wings.
I think the Ju-188S and Ju-188T would have been interesting had they been developed more. They were built but never tried with a defensive armament. I believe these two could have been good interceptors with bomber killer armament.
High-altitude versions
In 1943 it was planned to upgrade the entire lineup with even more wing area and a pressurized cockpit for high-altitude work. A single basic airframe would be offered in three versions, the Ju 188J heavy fighter, Ju 188K bomber, and the Ju 188L reconnaissance version. All three did away with the under-slung gunner's compartment, leading to a cleaner nose profile, and the bomber and recce versions mounted their loads in a long pannier under the middle of the plane instead of the deeper fuselage of the G and H models.
Simpler versions of these with no defensive armament and even longer wings became the Ju 188S fighter and Ju 188T intruder. With Jumo 213E-1 engines 2,100 hp (1,544 kW) at take-off and 1,690 hp (1,243 kW) at 31,400 ft (9,570 m), the Ju 188T could reach 435 mph (700 km/h). Operating at this altitude, the Ju 188S could carry only 800 kg of bombs.
Before any of these could start production, the entire lineup was renamed the Ju 388, the vastly improved performance warranting this change in name.
http://en.wikipedia.org/wiki/Junkers_Ju_188