After we’ve seen a teaser photo with its carbon fiber roof, the Japanese automaker decided to officially unveil both the 2011 Subaru WRX STI tS and A-Line tS which will be available exclusively on the company’s home market starting from January 2011.
The 2011 Subaru WRX STI tS which is obviously based on the four-door version WRX STI comes with special features like an aluminium engine bonnet, a carbon roof which we already mentioned, an STI tuned suspension and new 18-inch alloys while the interior has been upgraded with sport seats, a Push Engine Switch and various other ornaments.
Powering the 2011 Subaru WRX STI tS is a 2.0-litre turbocharged 4-cylinder Boxer engine, packing 305 HP and 430 Nm of torque while on the A-Line tS the automaker has fitted a 2.5-litre single scroll turbo unit producing 300 HP and 350 Nm of torque.
The 2011 Subaru WRX STI tS uses a 6-speed manual gearbox while the A-Line tS received a 5-speed automatic.
The 2011 Subaru WRX STI tS price starts at 4,020,000 yen in Japan, and production will be limited to 400 exemplars.  
Subaru press release :
Subaru Tecnica International (STI, President Hiroyuki Karamatsu) announces "WRX STI tS" and "WRX STI A-Line tS" special specifications vehicle that are based on 4-door SUBARU WRX STI and WRX STI A-Line (AT model) featuring the unique equipment and tasting. They will be available at Subaru dealerships throughout Japan from 25, January 2011.
The "WRX STI tS" and the "WRX STI A-Line tS" based on 4-door SUBARU WRX STI models are STI complete cars adopting STI’s unique specifications equipment to exterior, interior and chassis, and give drivers even more satisfaction to own and drive the vehicle. This is the third tS model since the release of Legacy tS in this June, the carbon roof* jointly developed by Fuji Heavy Industries and Toray Industries, Inc.** is adopted to SUBARU mass production vehicle for the first time.
These models have been designed to provide drivers with "feeling of superior handling" under the concept common to all the STI complete cars "Sport, Always!" (which means "interacting with the car is always like playing sports, at anytime and on any roads you drive"). The new models are equipped with components including Flexible Rear Support and Rear Suspension Link, in addition to the front and rear Dampers and special Coil Springs tuned by the STI, Flexible Tower Bar front, and the Flexible Draw-Stiffeners that have been adopted to the R205 model released in 2010. Further, components such as bushings are also tuned to provide "Flexible yet elegant drive feel" which is the distinctive feature of the STI complete car. Also, carbon roof and aluminum hoods are adopted to achieve both weight reduction and performance enhancements. Other features include Front Under Spoiler, newly designed STI 18 inch alloy Wheel, side sill plates with the "tS" logo, special tS front and rear Ornaments, special STI rear Ornament, Steering Wheel with the "tS" logo, and Push Engine Switch. The MT model is equipped with Ball Bearing Turbo Charger.
Exterior body colors available: satin white pearl, obsidian black pearl, spark silver metallic, and WR blue mica. Also to enhance tS ownership, STI Real Leather Access Key Cover (red) is selected as the premium accessory.
Model     Price(excluding tax)    
WRX STI tS     2.0 L  Horizontally opposed 4 -cylinder DOHC
Ball bearing turbo     AWD     6MT     4,725,000 yen
(4,500,000 yen)     Satin white pearl*1
Body Colours :
Obsidian black pearl
Spark silver metallic
WR blue mica

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WRX STI A-Line tS     2.5 L
Horizontally opposed 4 -cylinder DOHC
Turbo     AWD     E-5AT     4,221,000 yen

Source: Subaru