Nothing's confirmed, but here's the interesting bullet points from the article:
-The next Super Sentai project on Tv-Asahi will have a train motif
-A Super Sentai show not only for children and hero fans will be born; but one that attracts railroad otaku as well
-Various railroad elements will be incorporated
-Names of the rangers will be something like "TokkyuIchigo", "TokkyuNigo", etc.; instead of colors like the current Sentai
-To transform, the Tokkyuger use electronic train tickets
-When riding on their mecha/giant robots, the Tokkyuger scan their
electronic tickets at train stations. There's a chance that the tickets
could run out of charge/funds.
-The article comments on how marketable trains are, and talks about
Kamen Rider Den-O's low ratings but unbelievable toy sales. It also
mentions Satoh's success post Kamen Rider.
-Railroad otaku will buy anything train related when it comes to
collectibles, so the toyline is not only going to be marketed towards
the Sentai fans.
-Collaboration will be carried out with real railroad companies, and
there's a possibility of the Tokkyuger trains to appear in real life, on
train tracks in Japan, for special tour packages. The tours would be
marketed towards kids, adults, and train fans.