Sotetsu has revealed its new 12000 Series EMU, which will be used for its through services to Shinjuku through JR lines to the public. The Sotetsu/JR portion of the Sotetsu Shin-Yokohama Line that connects Sotetsu Main Line to JR Tokaido Freight Line will commence service on November 30th this year while the Sotetsu/Tokyu portion won't be ready until 2022
https://news.mynavi.jp/article/20190328-sotetsu12000/