As reported yesterday at Phoronix, QEMU version 2.4 is being worked on, and has a variety of new features. ACPI 5.1, TPM2 support are two that’ll impact firmware.
http://wiki.qemu.org/ChangeLog/2.4
http://www.phoronix.com/scan.php?page=news_item&px=QEMU-2.4-rc0-Released