The next major update to the Zcash test network (z6) will be much different than previous network updates.
Instead of a complete reset of the network which normally wipes all test coins and necessitates recompiling of the Zcash core code; the Zcash developers will
natively implement a Hard Fork increasing the block size to
2MB.
This marks the first time the Zcash code will be tested with a hard fork so it will be interesting to see the impact on the test network and the miners. The z6 release is currently scheduled for
June 27th.
https://github.com/zcash/zcash/issues/1045
