I don't think that Kabuto wants to see Orochimaru again, because Orochimaru would take his powers from Kabuto and Kabuto would became his toy again...
I think that he made that alliance because just like Orochimaru he wants power of sharingan, he wants to see what Madara's plans are and use them for himself...also...Madara don't trust Kabuto and Kabuto don't trust Madara...so...Madara will betray Kabuto or Kabuto will betray Madara..they are both waiting for a good moment...