The more recent development in automatic transmission is dual-clutch system and now, being offered by Honda for its VFR-1200F. Even though VFR-1200F is not moped or underbone motorcycle, this development can be scaled for bikes below 150cc, in my opinion. We have seen the Honda’s PGM-FI version that has been transported to Honda Wave 125i, where it was thought impossible before. So, dual-clutch system might be coming soon to Honda’s moped lines.
More reading material can be obtained here: http://world.honda.com/motorcycle-picturebook/DCT/detail/