After Lifesigns: Surgical Unit missed its target June release date, I sent over an e-mail to DreamCatcher Interactive to find out what happened. The word is the game was pushed back from June and it is now track for a release in August. Not a huge delay and until then you can practice your (virtual) doctor skills with Trauma Center: Under the Knife.
Edit: Confusion clarification Lifesigns: Hospital Affairs and Lifesigns: Surgical Unit are the same game. "Surgical Unit" is the subtitle for the US audience Europe gets the "Hospital Affairs" moniker.