Renew Subscription for Nis 2010 using Nis 2011

Dear All,

I am new.  Used Norton for the first time.

I just download and install NIS2011 upgraded from NIS2010.

1) It is possible to RENEW my subscription NOW eventhought NIS2011 still cannot be purchased?  I have about 250+ days in my current subscription. 

I was thinking it would be cheaper buying renewal now.

2) If I renew now, what will happened?  Will I still be able to use 2011 or not? 

3) If I decided not to buy now, Do I still need to buy upgrade or full product for 2011....(since I have subscription for 2010).

Sorry for asking silly questions, I was using Kaspersky before but have recently changed to Norton.

Thank you kindly.