According to AppleInsider, Apple is going to refresh its iMac line soon; the new improved versions will be added with Intel processors and Thunderbolt ports. However Apple had updated the iMac line just nine months ago. Apple's new improved iMac line will soon hit the stores.
The new iMac line from Apple will feature a high speed Thunderbolt port swapping the miniDisplay port and newer Intel chips based on sandy bridge architecture; however the specifications RAM and storage capacity or graphic cards are still uncertain. Apple is considered the first to market the high speed Thunderbolt port for data transfer that works on the technology from Intel, and has the prowess to achieve transfer speeds 10GB per second.
Electronista has predicted that Apple might increase storage space options to 1.5/2 terabytes along with 4 GB RAM in high end models; they might also install high resolution cameras for better video chat experience.