Microsoft has introduced Update 3 for Windows Phone 8, just ahead of an expected launch of a big screen Windows Phone.It will be rolling out to Windows Phone devices over the coming weeks, but will take some months before it hits all Windows Phone smartphones. But it's coming, that's for sure.When it does land, it will offer a larger home screen, with more Live Tiles available on your screen at the same time. You will also find a Driving Mode, which controls the updates on your device when you are driving, reducing distractions when you are on the move. It also gives the option to automatically text anyone who calls or texts while you're driving, to let them know you'll be in touch at a more suitable time. That really makes a lot of sense, considering how many people you see on the road with a phone on the go.There are also new accessibility features, such as a screen reader app, which makes a Windows Phone device more suited to someone with limited eyesight, along with a screen-rotation lock, storage management settings and the option to set custom ringtones for contacts for texts, as well as custom sounds for instant messages, emails, voicemails and reminders.But perhaps the most significant update is support for larger smartphone displays, as well as 1080p screens. That's quite significant with larger screen launches planned by Nokia before the year is out. On top of that, there is support for quad-core processors too.If that appeals and you have a Windows Phone, look out for it before we leave 2013. If you are tempted by what it offers, look out for more powerful, larger screen Windows Phones in the very near future.