According to Livemint, the new MPV will be larger the the Ertiga. Maruti's Ertiga has been doing good business in India, but it cannot compete well against Innova which comes equipped with loads of space and power. The country's largest carmaker felt a need of a larger MUV to compete well in the higher segment, where Innova rules the market since it was introduced in 2005.
Codenamed RX, the new MPV is said to be an 8-seater, and will be powered by diesel engine larger than the 1.2-litre DDiS unit which does duty in the Ertiga MPV. It seems like Maruti sanctioned the development of the RX MPV in January 2013. The company wanted to keep this development secret, however Mint managed to get a note informing about the appointment of a chief engineer for their MPV project. Few of the Maruti's component suppliers have also confirmed the development of the RX.