Do we know that the Higgs boson actually exists, or was something that fulfilled our expectations created by the design of the experiment? Did the experimenters run a "negative control?"
That's why they're stating that they have discovered a new particle, this is observed fact, they were very careful not to call it the Higgs boson directly though the current models strongly suggest that it is. The media is who is calling it the Higgs.
Things are never as simple as they appear especially when they're looked at in greater detail so this isn't the final piece of any puzzle, it is simply a strong suggestion that the current models of the known universe don't have to be thrown out and that fundamental mathematics has proven without a doubt that theory can aim science in a manner to discover fundamentally new things which weren't observed before, the physical devices to test the theoretical math are becoming practical.
There's a virtual guarantee that as technology progresses that things will become more complicated, but that a particle has been discovered in the range of where the Higgs Boson should theoretically exist is statistically likley with 5 sigma precision, as more data is collected over time they should hit 6 sigma or better before the LHC shuts down for repairs. And there are possible upgrades that could occur in 2018 which would increase the LHC's collision energy by an order of magnitudel creating a higher chance of the new particle collisions creating even more data, and possibly finding new things.
They're 99.99966% sure this is not a statistical fluke... and that percentage will just increase with more data, though the LHC will be shutting down next year for repairs it has quiet a bit of data left to collect. They'll probably announce something more firmly stated by the time of the repair shutdown.
The really big thing is to keep this sucker running at red line as long as possible collecting as much data as possible because these datasets can be used to probe in more detail many physics questions, given a large enough dataset, possible signatures of the nature of dark matter could show up. As the mathmaticians ponder all this new data new ways to analyze the data will show up and we'll learn even more, perhaps discovering other not before seen interactions, especially after the proposed power upgrade.
I just hope they keep getting good data and useful models out of this sucker, because if they do, within my lifetime we may see projects that are even bigger than the LHC, not so much so in the ring super Collider aspect but I've heard that the next big tester could be a massive linear collider. What's important is to keep the public interested enough to not make them screen when they see the bill that's going to show up on their taxes when governments go to build these devices which essentially don't 'do' anything.