Apple have made a pigs ear of this, and I have no doubt they will refine this over the betas. It's just an inconsistent experience and it's not quite clear what you have to do sometimes.
iPhone 6 here. If I turn on the screen with my finger on the home button and leave it there, it briefly flashes 'Press Home to open' and then unlocks to home screen with no further action. So already that message is a bit confusing as it wasn't required. Secondly, if I unlock with my finger on the home button, then lift it, then place it down, that's no longer good enough - which is inconsistent with how it used to work AND the previous example I gave. Now you DO have to press Home to unlock.
It's all a mess. They have this concept of your phone being unlocked - the padlock in the status bar is removed - but still on the lock screen. I think it will confuse people. It's confusing me at times and I'm a fairly competent user. Just not a nice experience.