The only thing Kabuto seem to take further is mastery of Sage Mode. Not only was all his information about Madara and Akatsuki attributed to Orochimaru, but Orochimaru pretty much showed that had he wanted to, he could have brought back several powerful Edo Summons. In fact, despite what everyone believed, including Kabuto, there was a means of reviving the Hokages. So I would say that Orochimaru either knew or at the very least could easily figure out what Kabuto knew.
At the very least wouldn't Orochimaru be interested in how to acquire his sage mode?
Kabuto said it himself Orochimaru actually has desires to obtain the sage mode but his body wasn't healthy and capable since he needed a younger and new body, so wouldn't that at least be one of the things Kabuto is useful for ? I don't get why Orochimaru won't just take Kabuto's body for now before attempting to take Sasuke's, if that plan is still lingering in his thoughts.
Other than Madara, he's a dark question mark as to what he has potentials for on whichever path it's going to be and I've been wondering ever since he's been revived then doing the shinigami jutsu and vast amount of knowledge he has (after talking to the hokages).
There has to be some sort of sentiment he holds dearly towards Hiruzen and his legendary sannin partners, only way I see him being completely changed is if Jiraiya makes a reappearance (IF) or he takes Jiraiya's role in particular for Sasuke and Kabuto (mentor and student type thing) considering they have spent quite some time together already anyway. (these are all just what if's and fun thoughts people, not hoping for a Jiraiya revival and etc.)