Has anyone considered that it may be something else entirely?
ASIC miners were supposed to come out at the end of last year. If the group that's built them is hoarding and using them, instead of selling them, that'd explain why so many of these coins are brand new & how they amassed so many so quickly. In which case, we wouldn't have any idea what they plan to do with them - maybe they're going to start a traditional-style bank, or fund some big new initiative to bring BTC into the real world.
Food for thought.
Edit - did the math, over 9 months they would need to have accounted for about 28% of the total network power to accumulate all those coins purely through mining. A lot less if they're trading them for profit. Is it feasible?