The most accurate document reflecting the 1.1 vision is the NIME 2009 paper (zenodo).
Note that the OSC 1.1 Paper refers to a specification for 1.1 that was never published; there is no 1.1 "specification" in the style of the 1.0 "specification". Andy Schmeder and Adrian Freed "decided to let the above NIME paper stand as the authoratitive reflection of what we had in mind."