I would like to see a HTML5 implementation in AppGameKit too. I hope it fits with the cross-platform model without suppressing it. My only concern would be that due to any limitations for a browser-based output, it stops any other potential features rolling out. I'm sure Lee is already working through the implications of this one, because its a huge market.
For DBPro it's been done but it's not a pretty solution. Because it is DirectX driven to the core you need a plugin that emulates a very hefty piece of Windows and because its browser based, security will not allow it to interact with the DirectX you already have installed. And don't forget browser apps have to work on Apple PCs etc which don't run the native MS DirectX.