maybe too early
vmware seems to have yanked the blog post you pointed to.
I assume when you say mobile broadband you mean LTE... I could of sworn my latency even on LTE was well above 100ms on every occasion, but I could be wrong.
I do certainly have less latency between our main data centers in Amsterdam and Atlanta though, hovers at around 90-95ms most of the time. Not that I need to vmotion between them.