What did Riddle want from Ginny?

[caesian]

No: HPFGUIDX 111378

Well, I feel like Hannah Abbott: I lost my head completely and somehow 
managed to multiply a ferret into a flock of flamingos (OotP, O.W.L.S.) 
over on the Snape thread.  I might have driven Kneasy to swear off 
romance entirely - and he used to have a thing for Madam Rosmerta!  Oh 
well.  Sorry.  (wait a minute - do you think she's on to us with that 
ferret-flamingo reference?  Draco would be the ferret, and then... 
nevermind.)

So, in penance, I went digging around for some really, really obscure 
Canon.

For example, anyone else notice that poor wizard Barruffio, the one who 
pedals Brain Elixer (OotP, O.W.L.S.), said 's' instead of 'f' and found 
himself on the floor with a buffalo on his chest (PS, Hallowe'en).

But what got my interest was this question and answer on JKR's official 
Website in the FAQ section:

Question: In 'Chamber of Secrets', what would have happened if Ginny 
had died and Tom Riddle had escaped the diary?
Answer: I can't answer that fully until all seven books are finished, 
but it would have strengthened the present-day Voldemort considerably.

My first thought was, is that really a frequently asked question?  I 
mean, who are these genius kids?  And who cares?  He didn't escape and 
the diary is destroyed.  Interesting that it was included.  It was 
posted before the whole HBP announcement, or any mention of a long-lost 
link between CoS and HBP.  (Sneaky.)

Second, could this be the plot that was entirely removed from CoS?  
I.e., is the explanation of what happened between Ginny and Riddle, and 
what he stood to gain, removed from CoS to be included later?  I would 
assume it pertains to the nature of the present-day Voldemort.  What 
was he getting from Ginny?

According to the text:
"So Ginny poured out her soul to me, and her soul happened to be 
exactly what I wanted."

hmmm.  Very changelling hypothesis. 
(http://www.redhen-publications.com/Changeling.html)

Also:
"All the while he spoke, Riddle's eyes never left Harry's face.  There 
was an almost hungry look in them."

yikes, watch your soul.

Caesian