BFL states that warranty for even end-of-life products is to be no less than 1 year from date of sale (this can be found in the FAQs).    I believe that BFL has stated that a new product line is only when a re-design of the chip is done on a lower die size, so that is obviously a long time away from now.  65nm is still pretty new for a small company to make a custom chip on, and recouping the development costs will most likely take some time. 

Once we stop manufacturing that particular product, we will not be able to warranty the product any longer, since we no longer have replacement stock.