OoP Spoilers - Hints left hanging

[Missy]

No: HPFGUIDX 64253

> 3) Aberforth Dumbledore.  I can't believe that JKR would tell us 
that 
> Albus has a brother without him coming into the story somewhere.
> 

This is the second time Aberforth is mentioned.  And I've wondered if 
he isn't the bar keeper at the Hog's Head.  The bartender was tall, 
thin, long gray beard and hair.  I'm pretty certain Aberforth will at 
least be mentioned again.