According to a tweet by OnePlus a few minutes ago - The launch is supposedly planned for London, on the 29th of October. Rumored specs are a 5 or 4.9 inch Full HD display, 2Gb of RAM, running either a MediaTex 6795 or SnapDragon 801. 13MP Sony camera sensor at the back and a 8 Mp in the front. The battery capacity is believed to be 2450 mAH. With those specs, it isn't really a mini offering, however how well they pack the screen is to be seen. Dimensions according to a Chinese website are 140 x 69 x 6.9 mm which put it in the league of the iPhone 6 (slightly bigger in height and width). The important bit would be pricing. The SnapDragon 801 is not that old a chip that it cannot be considered relevant today. If the performance of the Z3 Compact is anything to go by, this might be a slightly lower performing device to reckon (720P display vs 1080p).