3.X Kernel for OpenVZ is out and it is compiled with rbd module:
root@debian:~# uname -a
Linux debian 3.10.0-3-pve #1 SMP Thu Jun 12 13:50:49 CEST 2014 x86_64 GNU/Linux
root@debian:~# modinfo rbd
filename: /lib/modules/3.10.0-3-pve/kernel/drivers/block/rbd.ko
license: GPL
author: Jeff Garzik <jeff@garzik.org>
description: rados block device
author: Yehuda Sadeh <yehuda@hq.newdream.net>
author: Sage Weil <sage@newdream.net>
srcversion: F459625E3E9943C5880D8BE
depends: libceph
intree: Y
vermagic: 3.10.0-3-pve SMP mod_unload modversions
There will be new things to test ...
By default, no CephFS module.
The announcement of the publication of the source code : http://lists.openvz.org/pipermail/announce/2015-April/000579.html