Dumbledore's Triumph -- does it mean Voldemort can be redeemed?

[Claire]

No: HPFGUIDX 151607

Hi guys,
Sorry if this has already been posted before!
I've just re-read all the books again (for about the hundreth time),
and I came across something I'd either forgotten about, or not really
noticed. It's the bit in the Goblet of Fire where Harry tells
Dumbledore that, after taking his blood, Voldemort is now able to
touch him without pain. In it, Harry thinks he sees a look of triumph
in Dumbledore's eyes. 

Any theories on that? I read one which suggested that it meant that Voldemort could be redeemed as he now has self-sacrifical love in his veins. Not sure I buy that one tho!

Claire