Itsa_Me_Mario
¯\_(o_o)_/¯
I don't think it'll be 6.7", or at least I hope not. I think Antutu just screwed up with those results. It also said there were 3 front facing speakers, when we can see there are only just two.
Yes, Antutu's results contradicts itself - it can't be 6.7" and also be 494 PPI. It's either 6.3" and 494 or it is 6.7" and 491. As indicated in the post linked above, it is almost certainly closer to the 6.3" value, based on other information that has been publicly leaked, etc.