If you press the home button from a non default home screen, it will take you to the default screen. This happened even in 4.1. Therefore, from within an app opened from a non default home screen, pressing the home button twice will take you to the default home screen. I would not call this a bug, instead increased functionality.
In addition anyone having an issue with 1x connecting to data. Signal Check will show a 1x connection only, but no data, whereas in the same location as before the 4.3 update, 1x would connect to data no problem.