Answer to your 1st Query
One is not sure whether the Rajya Sabha will pass the Companies Bill 2012 in the current monsoon session of the Parliament. If it does then you may have to wait for ICAI's Notification regarding its applicability and purchase the book accordingly.
However, if the Parliament were unable to pass the Bill in this session, then everyone would be keenly watching again for the winter session of the Parliament. If in case it gets pushed for the winter session, you can safely bet that it is most unlikely that the Companies Bill 2012 will be made applicable for May 2014 Examination.
I suggest you to continue studying from the existing material for the time being and at the mean time watch out for ICAI’s Notification on the same.
Answer to your 2nd Query
Usually the books in DT and IDT for May 2014 attempt are available in the market by end of December 2013 or by Early January 2014. At the meantime, you can cover the Wealth Tax portion (10 Marks question asked in the examination) and also buy the ICAI's Supplementary material of Amendments in DT and IDT which is available at the sales counter at a branch / chapter near you. Also, keep yourself in touch with the subject from the ICAI's study material to get yourself familiarized with the topics / syllabus.