Warhawk was first announced to the public in May 2005, with a working build shown at E3 in 2006. This version was the first PlayStation 3 title to be shown with the newly announced SIXAXIS motion sensing technology. In February 2007 it was announced that the single player element of the game was to be pulled. This was due to concerns Incognito had over the quality of the single-player campaign, particularly when compared to the multi-player modes. Dylan Jobe, the games director said “if we were to continue down our single-player/multiplayer approach, it would have resulted in not as good single player or not as good multiplayer”. The extra development of the multiplayer mode was used to improve existing elements such as in-game talk, and to implement new features such as On Demand Split Screen, whereby players can easily enter split screen mid-game. [Info from Wikipedia]
The HUD looked different in the beta.