Michelle Gomez is leaving after this series she said so in an interview. She said Peter is 'her Dr' and its the perfect time to leave when he does. Will miss her I love Missy.
I dont think its pushing Bill being gay at all, as pp said if she had invited a bloke round there wouldnt be people saying 'oh shes hetrosexual is she, big deal'. And the fact that her friend was black, erm Pearl isnt very peely wally herself! She even refers to knowing what racism is in a previous episode. Whats the difference if she is gay, straight, black or white.
I am curious as to why Missy was sentanced to death, no doubt something weird and wonderful and global 
Of course Missy is in the vault, the Dr spoke to her at the end of the episode!
I didnt find it confusing at all once it got going I liked it. Wonder how he will fight the Big Bad thats coming?
I also like the references to River, I like her, shoot me now 