Network Edition includes all the features listed hereAND the networking related features.
Each purchase of Network Edition comes with 2 Client Licenses, which means you are allowed to install the software on 2 computers on the same network to be used by 2 different users. If you require more user licenses, e.g. for 9 users in your network environment, you may purchase 5 copies which in turn grant you 10 Client Licenses.
There will be no free upgrade entitlement. If you wish to keep your software up to date, you may consider the Network +1 Edition.