The media learned on May 19 that the Rakuten Eagles are planning to put together a third team, separate from Ichi-gun and Ni-gun, made up mostly of young players (Ni-gun, Ikusei) that stay back at the Izumi training facilities in Sendai.
The new team is scheduled to play about thirty games a year against university, Industrial League, Independent League, and various club teams. Most of the games will take place at the main field located at the Izumi training facilities.
[UPDATE @ 7:32pm]
The Eagles posted an official announcement about their new Ikusei team.
Source: Rakuten announcement