Last week JR Hokkaido announced that this summer stainless-steel 733 series emus will be introduced on the airport kaisoku services running between Otaru and Shin-Chitose Airport. These will be 6 car formations, with 5 cars in all-longitudinal seating configuration and one car with reserved ticket airline-style seating ("U-seat"). The 733 series used for these services will be designated the 3000 subseries. Current 733 series units are run in 3 car formations, or in formations with other types as 6 cars. With the introduction of these units, the remaining 1960's era 711 series emus will be retired by the end of the fiscal year.
http://www.jrhokkaido.co.jp/press/2014/140514-1.pdf
733 series on the Chitose Line between Shimamatsu and Kita-Hiroshima:
http://www.youtube.com/watch?v=MFbqOVZbgbM
Simultaneous arrival of two 733 series trains at Shiroishi (the one on the right is coupled with a 731 series):