I'll try and find the journal article this was published in. The trick for these scientists will be to prove that the bacteria were not contaminants that they brought up there. They'll also need to find a way to cultivate them under conditions in which they can survive, and do genetic analysis to see where they fit in the among known organisms.
What would be most interesting to me would be to learn whether they have novel metabolic pathways that use non-visible light for photosynthesis.
* edit -- looks like this is unpublished -- they'll probably publish it in a year or two after working on it in a lab.