I think Citrix does two things with this; it potentially stops losing more market share to KVM, particularly in regards to OpenStack, and it also will potentially eat in to ESX market share. In the last slides I saw at http://personal.crocodoc.com/4YprKmn KVM was at 71% of deployed OpenStack installations and Xen was at a combined 13%.
FD: I've worked at VMware for the last 11 years and have worked on ESX since 1.5.
FD: I've worked at VMware for the last 11 years and have worked on ESX since 1.5.