I would recommend to name the upcoming Support build 1.5
The PHP requirement is a braking change for all those who "just press the upgrade button" - like me.

I think that the PHP requirement is justifying the change of this decimal.
It is later easier to write 1.4.15 than 1.4.14.x if some furter effort is taken with the 1.4.14
And there are still some decimals left till reaching 2.0