We were teased with the inclusion of an introduction screen in a recent update to Lync 2013 Mobile for Windows Phone, but as of Monday 6th July, version 6.0.1430.0 has been released – Skype for Business for Windows Phone.
At the moment, it seems to only be available for Windows Phone, with pretty much the same features, with an updated UI as it seems, but I will update if and when I find any differences, also as and when the iOS and Android apps are released – Happy Monday!
Skype4Business UC 