That's the answer to your question. It really is a new currency, but everyone with Litecoins gets an amount of the new currency equal to their Litecoin stake.
After that, Litecoin and Litecoin X11 are separate entities, which will not have the same price. Possibly Litecoin X11 will be worthless, if it doesn't get much support. Like any digital currency of this kind, it will be worth whatever people are willing to pay for it. Exchanges will have to opt in to accept Litecoin X11, as a separate currency from Litecoin.
That won't happen, the exchange will be on only one of the two branches and thus will only accept transactions on that branch. So double spends are not possible unless the exchanges switches branch at some future time.
There's nothing stopping an exchange from offering LTC and LTC X11. Once the fork happens, there will be two clients on separate block chains.
I guess when this fork happens, I'll have a handful of LTC X11, and I guess I'll dump them for BTC at whatever bargain price they're selling for, as I can't imagine how this could end well.
That's the answer to your question. It really is a new currency, but everyone with Litecoins gets an amount of the new currency equal to their Litecoin stake.
After that, Litecoin and Litecoin X11 are separate entities, which will not have the same price. Possibly Litecoin X11 will be worthless, if it doesn't get much support. Like any digital currency of this kind, it will be worth whatever people are willing to pay for it. Exchanges will have to opt in to accept Litecoin X11, as a separate currency from Litecoin.