NetApp's Responsibility -- Do no harm, but do something
NetApp of course positions this as non-disruptive to their current offerings. Really it is too soon to tell what will happen and to some extent not fair for us to expect NetApp have all the answers. What we have to hope is that NetApp lets Data Domain be Data Domain and where Data Domain is a better fit, have the NetApp products step out of the way, at least until the Data Domain technology can be integrated in.
The best advice is to let Data Domain run as a stand alone entity for a very long period of time and then slowly in the background pull some of the Data Domain technology into the traditional NetApp products.
Deduplication is not a feature -- its a market.