A few possiblities for coming books

[balbu84]

No: HPFGUIDX 73028

In book 4 and 5, Rowling mentions a few times Voldemort's will to 
build up an army of creatures, such as giants, goblins... Yet we 
never saw it in these two books. One can then think that it will be a 
major point in book 6. As a matter of fact creatures themselves are 
often spoken of (Giants, House Elves, Centaurs,.. ) and we can 
already see a few of them willing to let the MoM fall. Besides, that 
could be a way to use Bill in the story:I explain myself: He is the 
only Weasley brother that hasn't been involved in great events so he 
will probably be used in next books. Moreover he works at Gringotts, 
with goblins. Then he could be the wizard who will try to convince 
them to stay.
As regards house elves, Dumbledore mentions them several times when 
he discusses with Harry after Sirius' death and he says something 
like: We wizards have mistreated our fellows for too long and we are 
now reaping our reward. After that we can guess that the reward is 
not yet finished...
Quentin