Niilo Alfthan tweeted during Nokia’s question and reply session on Twitter about Nokia Design that all phones with glass displays are made from Gorilla Glass. 
It looks like the change from resistive touchscreen to capacitive touchscreens had resulted in Nokia using Corning’s Gorilla Glass, which is advertised as being tougher to break than regular glass as well as being more scratch resistant. The Nokia 5800 series phone before that employed a resistive touchscreen layer and did not use glass. Nokia had transitioned to glass displays starting with the Nokia X6, which is the first Nokia capacitive touchscreen phone.
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