Just did some quick research...Diet Coke and Diet Pepsi still use aspartame (Nutrasweet) as the artificial sweetner, but Pepsi One and Diet Mountain Dew both now use sucralose (Splenda), along with acesulfame potassium and aspartame.

I won't touch aspartame. I'm more ambivalent about sucralose. Maybe Firmenich will sell the sucralose enhancer to Pepsi to be used in some of its diet sodas. Not sure what the advantage for Pepsi would be in doing this. It might just boil down to cost. Either way, we'll probably never know the specific products in which SNMX's sucralose enhancer is being used (sold as flavor ingredients by Firmenich), only the total $ amount in royalties that SNMX receives from Firmenich.