I thought I read somewhere that it was going to take months to reach full power. But that article you linked says the first protons are being injected on Wednesday, so hmm...
I highly doubt it'll be the end of the world, and if it is, I won't be around to care, so I'm going to go on presuming that this will go the way of all the other "end-of-the-world" predictions. But we may get some pretty cool science news soon
Still, that doesn't mean I mightn't be up for a mid-week party...