As Voluntary already pointed out, you will indeed need new addresses when Zcash officially launches.
I also agree that while it is great to prepare and be ready for launch in advance there is no need to get too excited as the slow start will allow ample time to get everything ready even if you are a few hours or even days late to the party. Unlike ETH where there were already ~60 million coins in existence, Zcash starts with a pretty level playing field of 0 coins at launch and maybe only a few hundred on day one.