ESS services in 4.7 Enterprise

Hi,

I heard that many ESS services have been converted from template based to SAPGUI for HTML so they look "different" in 4.7. Can somone throw more light on this? Is ITS going away and do we have to modify any HTML template based custom ESS services that work fine on 4.6c later on?

any inputs are welcome,

TIA,

Suresh Datti