The archives have many restrictions on their records, 100yrs, 75yrs, 60yrs etc. It is frustrating when I see a record set which contains information relating to pre-1900 events but also holds records of the early 1900's that hold up the release of the earlier records.
The other frustrating thing is that records must be coming available every year but unless you are lucky enough to stumble across them, you'd never know. Perhaps in the interests of researchers who aren't professional enough to have this information, Archives could put out a monthly newsletter or such. They must know what changes their records have or are going to have soon.
I came across this record today but we will have to wait until 2014. It's the New Plymouth Prison Punishment records 1865 -1914.