Firmware v1.2 and SDK

Hi,

The new firmware 1.2 is coming soon and will support DataWedge, as we are using (Firmware 1.1.x) and the Concierge SDK (Concierge SDK reference) for developing our apps, we have some concerns and questions,

Whats the best (or correct) tool (EMDK for Android 3, Concierge SDK or even RhoElements) to develop on Concierge Firmware 1.2 ?

Should we expect to change or rewrite our code already running on Concierge Firmware 1.1.x ?

Thanks for clarifying.