I really hope they don't call 1" diameter darts "Megas" since for the last decade or more we've used that term for 5/8" diameter, and use "Mongos" for 1" diameter darts (popularized ForsakenAngel circa 2008?).
This is an interesting design though. To market towards the looozars, they up the range (supposedly flat ranges too, which is nice). But then to keep to their safety standards, they increase the diameter to distribute the impact more. I'd guess the new darts have even more impact absorbing designed into the tips than streamlines (deforming the hollow tip absorbs most of the kinetic energy). However, to get that much energy to the dart while letting little kids used it, it sounds like they used a spring that's not very stiff, but is really long, hence the 2' plunger tube.
All that said, if those spec's are right, it's still of very limited modding use to us. We don't really want 10"+ long strokes, which limit rate of fire, comfort and, as it turns out, efficiency. This seems to be just as hurt as most blasters by being targeted to kids, which is of course unavoidable. It surprises me that any production company would openly suggest some capability for modding, since the official stance is always "do not modify this product."