A brand new Optima sedan will make its official debut in 2015 and we have a nice 2-minute long spy video to preview all the new tech. The car we've managed to film at the Nurburgring is probably the very top-spec model, the Optima Turbo or Sport.It's clearly powered by a throaty new 2-liter T-GDI turbo engine pushing somewhere in the region of 250 horsepower. Hyundai has just dropped a similar mill into the 2015 Sonata Sport sedan, coupled to a six-speed automatic gearbox with steering wheel mounted paddle shifters and lowered suspension.The 2016 Optima Sport would probably target only a very small niche if offered in Europe, where it would compete with similarly powered Ford Mondeo and Opel Insignia models. However, it would be popular in America.A recent report from Korea suggests the R&D vice chairman at Hyundai Motor Group, Yang Woong-Chul, stated that plug-in hybrid versions of the Sonata and Kia Optima will be launched next year onto the global market.This is likely to be based on the technology developed for the normal Optima Hybrid, but with a larger battery pack added and a more powerful electric motor with around 100 horsepower that can power the vehicle independently.Yes, plenty actually. Kia unveiled a concept called the the Optima T-Hybrid at the Paris Motor Show. This is more like a future technology demonstrator than anything else and combines their 1.7-liter diesel engine with a 15 hp electric motor, a 48-volt lead-carbon battery, and an electric supercharger.Thanks to all of this, the output of the car is increased by 20%, while the CO2 emissions drop by -20%. It's a good deal, if you ask us, and it also gives the Koreans a worthy rival for the bigger 2.0L turbodiesel engines used by the Optima's big rivals. This twin-charged motor will likely not be ready until 2016 though.