Today the official announcement went out from upstream qemu mailing list that version 0.13.0 is now available. No announcement was made for downstream qemu-kvm but version 0.13.0 of qemu-kvm has been available from their sourceforge site since yesterday. Version 0.13.0 comes with many changes since 0.12 version and there’s no official changelog published. Upstream qemu lists the following as some of the major features added since 0.12.0 which were inhertied by qemu-kvm.
As noted in the qemu announcement, qmp is still considered unstable.
You can download this latest version of qemu-kvm at the following link