From Benjamin Mayo in 9-5 Mac Rumors: https://9to5mac.com/2018/03/27/new-apple-watch-larger-screen-series-4/ Story features a "trendy new design" and longer battery life. ( The battery could have longer life because of new circuit boards and a new SOC.) 15% larger face is spoken of. Not sure if the case will be bigger or smaller bezels. Interesting and exciting. --- Post Merged, Mar 27, 2018 --- I am pretty sure Apple would keep compatibility with the current band attachment mechanism. Bands are a good revenue item for Apple and the townsfolks would storm the gates with lanterns and pitchforks if they changed band systems.