Some time in the month of June, Rise of Nations: Extended Edition will be released on Steam. Skybox Labs and Microsoft Studios will release the classic RTS to fans for $19.99 (USD). However, if you pre-order through Steam, you will save 20% and pay only $15.99.
In Rise of Nations there are:

The Extended Edition includes the base game and the Thrones and Patriots expansion. There are some added bonuses in this release.
Improved Visuals
- Improved water
- Improved textures
- Full-screen anti-aliasing

Full Steamworks Integration
- Multiplayer with ranked matches (ELO)
- Achievements
- Trading Cards
- Cloud saves

Extended Features
- Twitch Integration