Otzma will probably bid to join Yachad. I sense it will come. Otzma needs to join someone in order to get in the Knesset. Yachad is projecting more seats and will need more representatives. It will likely include Otzma and/or Tekuma.
.... Their are other individuals such as Rabbi AmSallem but I doubt that Yishai will want him in his party at least RIGHT NOW in these elections. He is too risky to have in his party at least right now.