What will happen to Kreacher?

[Wanda Sherratt]

No: HPFGUIDX 73170

Now that the Black family line is extinct, what will happen to 
Kreacher? Does he have to stay with the house?  Will he 
be "inherited" by whoever takes over the property?  Or is he free 
now?  I've never heard what happens to a House Elf when he is left 
without a master.  This would have happened to Winky, too, but she 
was dismissed by Mr. Crouch before the family came to an end.  
Frankly, I'd like to see Kreacher taken to Hogwarts (it's the sort 
of thing Dumbledore would do), where Dobby could teach him some 
manners!

Wanda