Today kvm-74 was released featuring another merge with qemu-svn. The most obvious feature for users are usb autoconnect and disconnect feature  . General stability and reliability have been improved as well. As well, this is the first release that supports building the kvm external module for ia64 users. The official list changelog as described on the mailing list is shown below:
 

Changes from kvm-73:

- make real-mode startup state conform to spec
- fix scheduling error in experimental big real mode support
- fix reboot fault handler exception table entry (Eduardo Habkost)
- x86 emulator code cleanup (Roel Kluin)
- fix 'neg r/m' instruction emulation forced to byte size
- fix shadow ptes corruption on i386 hosts running smp guests
- fix kvmtrace ABI breakage (Adrian Bunk)
- enable virtio for ia64
- add generic shadow page table walker
- allocate internal guest memory as MAP_PRIVATE
- don't call get_user_pages(.force=1)
- paves the way for get_user_pages_fast()
- add mov r, imm instructions to the emulator (Mohammed Gamal)
- realmode emulator testsuite
- ia64 external module support (Xiantao Zhang)
- support tap IFF_VNET_HDR (Mark McLoughlin)
- merge qemu-svn
- improved usb support
- usb auto connect/disconnect
- protect against possible corruption during qemu fork() on older hosts
(Marcelo Tosatti)

KVM-74 can be downloaded here