"In order to improve acoustic quality, the thickness of the impeller trailing edge of the fan blades has been thinned to 0.3mm. Perforations have been added to the impeller hub design to further improve fan performance characteristics." (qtd. on Product Change Notification# 110007). This does not mean your current heatsink/fan does not meet the specs of your processor. It was designed to actually meet them and thus, make the cooling of the processor sufficient enough to keep it under functioning conditions. There is no expected change or impact to customers.
Note: I regret to inform you that Intel only does warrant replacements for defective parts, only.