There are entire transition teams that do nothing but this. It's such a massive transition of people and offices that they have to. They coordinate a clear handoff from one administration to the other. It includes just about anything you can conceive, including things like transferring ownership of the official Facebook and Twitter posts
Security briefings actually begin during the election itself. The intelligence community began doing this after Truman was elected in 1948 and then only found out 12 days AFTER taking office that we'd been working on a nuclear bomb with the potential to end life on the entire planet. Both Clinton and Trump have been briefed on classified materials since early August.
Some things, however, do need to wait and I believe that depends on the level of classification. Some stuff is just too sensitive to share with anyone not yet elected (though information flow will likely increase dramatically beginning later this week once we have a defined presumptive future POTUS).
What types of secret privileges do you mean? Like if Clinton wins the secret service will begin carrying her bottle of hot sauce for her or if Trump wins he can go into any female dressing rooms he wants and not just those of the Miss Teen USA pageants?
Maybe these will help: http://presidentialtransition.org/https://en.wikipedia.org/wiki/United_St ... transition