Possible implementations:

1) Return to original target. Note I believe this won't work for
RMI-based targets (could be wrong).

2) Everyone randomly picks new targets when a new node joins. Bad as
this causes max # of failovers.

3) Determine what the new servers are. Say 2 out of 6 are new. Calc a
random and see if < .33; if so randomly pick one of the new servers as
your target.