Do you think she will be a Metal Man?
I think she might be a modified version of the "Lady Luck" character that Johns teased last year.
Lady Luck will make an appearence in Phantom Stranger 6 i think
So it can't be her :-P
Putting some metal people in various other teams should be ok. Maybe even just focusing on a main metal person might be a good strategy for a comic book title. Orion comic book also lasted quite a while if you compare it with the various New Gods series.