Sebastien, The preview uses a centos install with a custom repo for the XenServer goodies. Details in the link:
http://xenserver.org/blog/entry/tech-preview-of-xenserver-libvirt-ceph.htm l XAPI is part of this and this appears to be the way forward with regards to distributing XenServer as opposed to having XCP, XenServer and open source Xen as different things. Have a feeling that if you install the xenserver packages though you won't get the latest bleeding edge Xen as before. Adrian
