We've been half jokingly referring to the MicroRocket as the PRII. Maybe we really shouldn't.
Quick, what's MSR's high end, lightweight gas stove? They haven't got one (before the MicroRocket).
They're not replacing the PocketRocket; they're filling in a hole in their product line.
For those who want a more entry level, low price point stove, there's the PR. There's no indication that they're discontinuing the PR. For those who want something nicer, more durable, lighter, and more compact, there's the MicroRocket. MSR has just entered the high end market space that stoves like the the Soto Micro Regulator, the Primus Express, etc. have occupied unchallenged (by MSR) so far.
At first, when I viewed the MicroRocket as a PocketRocket II, it almost didn't make economic sense. But if one views it not as a replacement for the PocketRocket but rather as a new addition to the line up, I think it's a shrewd move by MSR. They mean to compete.
HJ