Micromax Canvas 4 or the Micromax A210 is now listed on the Saholic website with a coming soon status. They have not mentioned the price and the specifications are incomplete.
Maniacstore had listed the Canvas 4 on their site and have also started the pre-bookings, even when there is no official word from Micromax. It would be wise to wait for MMX to announce the full specs and probably you will also find the order link from the Micromax website itself. There could be delivery issues like what happened with the Canvas HD.
The Canvas 4 is also listed on the Naaptol website. But none of these sites have the official specifications or images and the specs that you see on their sites are unverified. Manicastore has clocked the quad core on A117 to 2GHz while on Saholic its 1.7GHz.
Better wait for Micromax official announcement of the same and would be wise on your part not to pre-book the handset for now.