It is reported that only the 4.7-inch model will be unveiled, and along with it an 8GB iPhone 5S.
Rumors have circulated lately, alleging that production of the 5.5-inch version has encountered problems.
Rumors of a delayed release of the device are not new.
KGI Securities analyst Ming-Chi Kuo claimed earlier this month that the production of in-cell touch panels and low-yield casing problems could postpone the unveiling of the phablet model.
It has been reported that the smartphone could be launched in 2015 or December 2014.