The Rakuten Eagles held a press conference today to formally announce the addition of Senichi Hoshino to the coaching staff. Hoshino signed a 1-year deal worth 150M yen and was also assigned the number 77. The Eagles have also posted detailed information from the press conference on their official site. NicoNicoDouga is also carrying parts of the press conference, which you can view here and here.
NOTE: I'm not sure if there is a block on the NicoNicoDouga vids for users outside of Japan. If there are, you can easily find footage on Youtube.
Incidentally, it seems there were 10 TV cameras and about 200 members of the media on hand for the press conference.
Hoshino will be on hand at tomorrow's draft.