I have re-opened my service-request with AVAGO/LSI concerning this and I'm still waiting for reaction...
Edit: Still no clear answer from AVAGO/LSI. Support-technician just promissed to inform me as soon as there is definite schedule for releasing SMIS-provider for EXSi 6.0. But apparently it is not planned yet, and he did not want to repeat "in about one month" again...