That's just the paperdolls, though. Which I've downloaded, now that I look at them, but it isn't the in-game avatar. Sadly, that's still just a glowing regular sword, and probably will be unless someone has a *lot* of time on their hands.
Some people aren't sure why it's such a hard thing to do, so I'll summarize things.
As explained above, the BG1 animation has different sequences. To make it work in BG2, you'd need all new SSE, ESE, ENE, and NNE sequences. Then there's the fact that the avatars swing their weapons differently than in BG1. They have more frames, I think, and the flame-sword, if just ported straight over to the sequences it already does have, would be all out of synch with the attacking player's hand. Hovering and whatnot.
I think if someone really does want to try their hand at this, my best suggestion would just be to start from scratch with the existing BG2 long-sword avatar animation, and add flame wisps to each flame manually. Ouch, eh? This doesn't even mention the fact that you may very well have to overwrite one of the existing weapon animations to add this. I'd suggest flails, because they suck and're ugly as sin, but it still bugs me to have to overwrite stuff, you know?