Computer research firm DisplaySearch has published its 2014 tech forecast, and is predicting that the next-generation iPhone (expected to arrive next fall) will sport a dramatically larger display. The report — which is not based on any insider knowledge, but has in the past been known to guess correctly on Apple’s moves — calls for as large as a 5.5-inch high-resolution display. The company also believes Apple may use AMOLED display technology for its rumored “iWatch.”…