63.2% of the last 1,000 blocks signal that they are ready for the v0.15 "APO" fork. This protocol update is about making DLCs nicer to use, ANYPREVOUT (APO) ensures that all outcomes of a DLC are in place before it is funded so all the parties of the DLC don't need to trust one another.

If you are waiting for a stable release before you upgrade, that is not necessary. v0.15 uses the same codebase as v0.14, which has been stable for a while now, so there is no need to wait.

More info at the announcement: https://talk.peercoin.net/t/peercoin-v0-15-released-apo-peercoins-layer-2/16548