That's the idea anyway. Using an HTML5 overlay you can move some of your game's functionality server side, so if you want to change it a bit you can.

San Francisco-backed company 

PlayHaven says it can fix that problem through a new service that places an HTML5 overlay on top of a developer’s app, allowing them to quickly swap in and out different types of units.

Many of the bigger developers like Storm8 already handle most of their content on the server-side, so they can quickly put new items in their store or test new cross-promotion campaigns. But smaller developers lack this advantage so PlayHaven’s product could even the playing field for them. PlayHaven is comparing it to a content management system or CMS, which made it easy for people without technical backgrounds to handle updating their sites quickly.

There's more on Inside Social Games.