TNG 2.0 wil come in 2 versions:
As Updater (1,03GB) for all installed TNG 1.x Versions and as complete Installer (2 parts, each nearly 1 GB).
Full installed TNG 2.0 has 2,2 GB.
But if you install TNG 2.0 you cant connect anymore to a TNG 1.x Server. They will be red in the Server List.
4 Servers will be ready with TNG 2.0 from the start up: