Simple query regarding companies act 2012

The preamble to the companies act 2012 states that it is an act to repeal the companies act 1956. i haven't got chance as yet to go through the same and therefore have this query .

Is this act an extension of the earlier act or that the older act (being repealed in entirety ) has been rendered inapplicable now ? I mean is the companies act 2012 an entire act in itself covering all aspects of companies law or just some provisons here and there ???

Rohit