Chile has invited China to join TPP.

http://gbtimes.com/business/china-considers-joining-tpp-meeting-chile

Without USA, Japan will be the biggest economy in TPP and this gives Japan a lot of bargaining power.  However, Chile has invited China to join TPP which will make China the largest economy in TPP and assume the leadership position.

If Japan makes things difficult for China to join TPP, China will not join TPP and focus on RCEP since it is leading RCEP.

Let's see how this will pan out.