Crossupmasta

I am considering buying the Prologic 5.1 system and the DD 5.1. I heard you have to tinker with it to make game sound come out the speakers right with the DD 5.1, im cool with this. I know that Doom III is coming out and will feature Dolby Digital. I was wondering if this is going to happen in more video games or just that one. Because if it isn't going to change to Dolby Digital it isn't worth buying the DD 5.1 because i watch my movies on my kick *** TV system.