You can construct your own management stack for your SDDC out of best of breed components. The composition of your SDDC Management Stack is up to you. But you should think carefully about how it is constructed and how the pieces relate to each other.
VMware will be the first vendor to deliver a SDDC. VMware’s SDDC Management Stack will be the first cohesive and complete management stack for that SDDC. The combined benefits of the SDDC along with management purpose built for the SDDC will allow VMware to deliver substantial value to its customers once these products all ship.