As you know, you are not receiving a proper response from Wipro, and you have a good opportunity elsewhere. You should not wait for a response from Wipro but proceed with the second option.
It has been two months since your interview, and you are not receiving specific answers from them. I personally don't think you should wait any longer.
We acknowledge that our system is not yet mature enough and lacks the responsibility to inform candidates of their interview status, causing problems. However, in today’s competitive world, one should not waste time waiting. You should not wait for their response.
If you have been selected in another interview with a joining date of May 9, 2012, it means you have been confirmed by the employer (2nd Interview). If you are still waiting for Wipro's response before joining them, and if you can find better career growth and opportunities with the second employer, you should not hesitate to join them without delay.
Furthermore, you have not shared much about this second company/employer. Could you provide more information about them?
Thank you.