Unlimited functionality is not available with SD5, even with SP1.
Most changes is made with SLM in SD5, and there's a file named "SD_Service_Level_Manager_Guide.en.pdf" which seems to be a good guide for new concepts of SLM. Also there's another one as "SD_Differences_Guide.en.pdf" that can help you about all enancements. And there's another one as "SD_Concepts_Guide.en.pdf", not for differences but maybe for starters of OVSD. All of these documents exists in SD5 SP1 media or http://ovweb.external.hp.com/lpe/doc_serv/?sdesk address