Well, not a LOT has been added to 7.x since 7.1. What is your reference point? There are some docs on the limitations of the 7.x product and not too much in the realm of features was added to 7.5. Have you looked at those?
NOTE that the main things "added" to 7.5 were fixes to the infrastructure and supportability of other OS's (e.g. MAC and far more linux versions).
Did you have specific questions?
If this is REALLY generic (e.g. how to get started in 7.5) there are some docs that may help you on this. Just let us know.