Depending on how long the speech has to be you may want to consider a specific area of gaming advancement, such as new controllers and user interaction, AI development, graphics advancement, and realism.
I did a paper on games before for a networking class, the main subject was about common issues with multiplayer games and how to overcome such obstacles (such as lag).
Then there's the new technology that allows different graphics cards to work together, such as an ATI and Nvidia running simultaneously.
http://tech.slashdot.org/article.pl?sid=08/08/19/2312234&tid=136