Well-known leaker Evan Blass tweeted yesterday that an iPhone 6c will be arriving concurrently with the upcoming iPhone 6S and iPhone 6S Plus, but new information from mobile marketing company Fiksu may fly in the face of that prediction. Fiksu’s web logs have turned up two new iPhone models — designated “iphone8,1” and iphone 8,2” — being used to access a range of popular travel, gaming and lifestyle apps. The company…