The Stick with the older home page layout will eventually get the software update, where you just need to be patient, where NowTV tend to send new software updates in batches rather than all in one go.
You could try a forced software update on the stick with the older software version by following these instructions below.
To check the software number go to the settings, system, about.
Fast Forward x3
One of my 3 sticks updated to version 5136 about 3 weeks ago, still waiting for the other two which are still on 4136. I have tried the secret screen but it just says update from 4136 to 4136, so is it just a case of waiting? Will it just update in the background and new homepage screen will appear when stick is on? (Don't leave my tv's in standby, I have smartplugs which I turn off at night).
Many thanks if you reply.