gokudre - Can you check what is on the screen when you click on start >> settings >> about? I am using the Energy.IMAGIO.21679.Sense2.5.Cookie.Sep.24 ROM and the response is as follows:
CE OS 5.2.21679 (Build 21679.5.3.9)
It looks like the 21679 version is the latest "released" version of WM 6.5.3 i.e. with the start button at the bottom of the screen instead of the top. The changelog for the LEO Sep.23 ROMs states "
Built on the new driver and kernel base from the new Tmobile official ROM just released..." here.