Great write up and some photo comparisons with the older, bigger modell. The new MSR Reactor packs smaller, is lighter, a spout, and a bit less efficient (3.5 min boiling times vs 3.0 min).
I for one am looking forward to getting one. I love the original Reactor (it’s a beast and well designed) but the 1.7L capacity was overkill for solo excursions, weight and size wise. This smaller unit makes it a somwhat more sensible choice for the solo backpacker.