Sneak peak at Unity 5 features: WebGL as a platform (build to web and launch without a specific Unity plugin), in game audio mixing, physically-based shading, real-time global illumination, new 2d physics affectors and other.
What do you feel about it? Personally, I think that WebGL build is the way to go.
And hey, it would be pretty exciting to have the mix sound controls in our Drum Simulator game 🙂