The Nokia Lumia 900 today arrived at the store where I work. I did what every mobile phone enthusiast does when meeting a new phone, i.e. I checked its software version ;)
The International Nokia Lumia 900 comes pre-installed with Windows Phone 7.5 Refresh build 8773 (aka Tango). This means that we get features like Internet Tethering out of the box. Sales will officially begin on May 25. Gigantti in Finland has this currently priced at 529 EUR.