Good question eh? The answer is yes, if you've either already attended a VI3 course, or will be attending a VI3 course soon.
The reason why? In my earlier post on the VCP on vSphere, I hinted that there would be a number of upgrade paths. Whilst nothing has been announced officially by VMware (yet), I can say that the path for an existing VCP on VI3 will be simpler than the path for those that have been trained on an official VI3 course but never took the VCP on VI3 exam.
Keep checking back here, or on the main Global Knowledge site, and all will be revealed as soon as we're allowed to say....