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There's a new lookupd in OpenStep for Mach 4.0, which works a bit differently than the old lookupd. The new lookupd has a number of "agents" that do lookups from various information systems (NetInfo, DNS, NIS, the Flat Files, and the internal cache). You can specify which information sources should be consulted, and in what order. You can also specify which information sources should be consulted for different categories. There is documentation for all this in the file /NextLibrary/Documentation/NextAdmin/ReleaseNotes/lookupd.rtf.
One change in NIS lookups is that a "+" in the /etc/passwd file does not trigger a NIS lookup. If you want user lookups to consult both /etc/passwd and the NIS passwd maps, you need to tell lookupd to use both Flat File and NIS agents. For example, if you configure all this in your root domain, you could set user lookups to use Cache+NetInfo+Flat Files+NIS like this: