Cubase 5 user upgrading to Cubase 9 - what's "new"?

Cubase
6

Loudness meter
Master meter
Quadrafuzz v2
New Maximizer
Frequency EQ - Frequency EQ is Freqin' Fantastic! - Cubase - Steinberg Forums

https://www.steinberg.net/fileadmin/files/PRODUCTS/Cubase/Generation_9/PDFs/Cubase_9_Feature_Overview.pdf