The following features/enhancements are proposed for Xen 3.4:

Performance and Scalability

- netchannel2 for accelerated guest networking * including VMDQ, VT-c / SR-IOV / smart NIC support

- scheduler2 * better RT, HT; gang scheduling; domain co-sched; power awareness

- page sharing and delta compression

- 2MB page support for PV guests

Manageability & Fault Tolerance

- Improved python XenAPI support (managed domains, CIM bindings)

- Better migration control protocol (including handshake, compat, rollback)

- VM checkpointing for h/w fault tolerance

- Machine check architecture support

- Native OVF support

XCI (Xen Client Initiative)

- Client device virt (e.g. battery status etc)

- GPU virtualization with Gallium

- USB 2.0 support, PV USB support

- Trusted HID

- Simple VGA/text-mode management console

Security

- Xen lockdown as standard (NODMA/DEV/VT-d etc)

- Trusted/attested boot

- "Page boxing" (confidential grants)

Misc

- SCSI PV drivers moving from experimental to supported

- pv_ops dom0 linux kernel

- SATA command virtualization

If you are interested in new features, please submit your ideas for Xen 3.4 to the xen-devel mailing list.