This launch has something in common with FH, both are constantly rescheduling.
This looks to be an "Enhanced Epsilon" with the larger second stage, but JAXA seems to have dropped the "Enhanced" descriptor for what is now the standard design. - Ed Kyle
New rumor details regarding the pressure sensor. Apparently the sensor failure exposed a QC management issue that is having knockon effects, and that the same sensor may be also used by Epsilon, which could reach back to bite everyone, because if Epsilon has another delay, that could push this launch straight out of the window.
English translation of the mission timeline