Hi greco,
all I can tell you for now is, that the OpenWorkdesk development team could already test OpenWorkdesk Community Edition on top of an IBM FileNet P8 system via CMIS API in the cloud.
Right now, we are talking to IBM as an official IBM Business Partner, if we could deliver OpenWorkdesk with the needed settings, to connect against their cloud.
We will let you know, when and of course how you can test your OpenWorkdesk deployment against P8 via CMIS.