Dragon-types's color is dark blue notdark purple (that's Ghost-type).

Even more information, the height and weight of Sparkling Blue Black Kyurem and Burning Red White Kyurem were also revealed so I'm going to post them along with Reshiram's, Zekrom's, and normal Kyurem's (they need to give that form a name...) height and weight:

Pokemon: Height - Weight (imperial/metric)
Reshiram: 10'06"/3.2m - 727.5lbs/330kg
Zekrom: 9'06"/2.9m - 760.6lbs/345.0kg
Kyurem: 9'10"/3.0m - 716.5lbs/325.0kg
Black Kyurem: 10'10"/3.3m - 716.5lbs/325.0kg
White Kyurem: 11'10"/3.6m - 716.5lbs/325.0kg

As you can see, Black and White Kyurem are the tallest with White being the tallest, yet their the same weight as Kyurem who is the lightest of the 3. Now I'm going to guess the reason for this is that, so far, only the weight mechanic has any in-game effect and they don't want to alter the weight to keep things balances (though then again this didn't stop them from altering Giratina's weight between its formes).

More news, it's been hinted that Famitsu maybe revealing a new Pokemon to us. Now new form/es have been announced as new Pokemon so if this report is true then it's most likely be this though the obvious question is, if this is true, which Pokemon is/are getting new form/es. Also throwing in another theory, it could also be about the two new event Legendaries revealed for the 14th movie: Keldeo and Meloetta. If I recall, there has been little information released for Keldeo and almost none for Meloetta so this "revealing of new Pokemon" could also turn out to be just them revealing more info about the two legendaries (and maybe their in-game event to get their signature moves).

Finally Pokemon Smash plans on revealing a lot of information about Pokemon Black 2 and White 2, so hopefully we'll finally be getting out answer if this is a sequel or not and if it is when does the story start up in relation to Black and White (along with other questions like if we're still playing as Hilbert/Hilda or new characters).

Where can you watch it live? Is it a website or you have to download something?

Try Keyhole. It's a totally free and legal program that can allow to watch streams.

Or just wait until the 15th.

Which is why you'll remain a Trainer and never a Master.

That's also the date when they'll start giving away Keldeo so it seems that they're trying to encourage you to use it in your playthrough of the game. Like with Kyurem and it's formes which is making it's anime debut in the 14th movie getting an extended role in the game, could the Legendary Musketeers who are also making their anime debut in the 14th movie also getting an extended role in the game? Or maybe they're trying to do what they did with Victini and give you a Legendary to start off with if you so choose to?