Subscription Renewal

I have NIS 2010 on my 3 PCs and the subscription is expiring in the middle of August.  I just purchased on EBay a 2 year 3 PC license.  Do I have to wait for the subscription to expire to get the maximum legnth of subscription extention(until mid August 2012) or can I put the renewal in now and still have the same expiration of mid August 2012?

 

Also, as Norton comes out with NIS 2011 and NIS 2012 am I entitled to the upgrade?

 

Thanks for your help.