This is not a new release but we simply removed 4.1 from the beta package and we made 4.1 available optionally. This is a bit too early but we had to do it while cleaning up GHI main site and updating the support page. We are planning to have WiFi and IFU done before the end of this month. G120 is done by the way as far is major features (SQLite, USB Host, USB Client) and we are testing little things like PWM and UART.
You can see the 4 downloads here (#4 is optional)
http://www.ghielectronics.com/support/dotnet-micro-framework