After thinking about it some more, I've come to a conclusion that it most likely won't be a >3000lm light. The reason is that the 90+ CRI versions of the 5000K XHP70.2 start at the brightness bin M4, and based on what I read in Cree's datasheets and the PCT, it can only squeeze out 3000-ish lm when pushed to the very limit of its spec (which is 29W), and only for a short time before thermal resistance (and/or PID on the light's side) effects kick in. So expect a 2800–3000lm figure as H1 peak brightness.
The more interesting question is what brightness it will stabilize at when it reaches the temperature target. Starting with mk. II, the SC600 series typically stabilized at around 6W fed to the LED (I believe the temperature target has been around 50°C/120°F all along). The dimensions of the light and its surface area haven't really changed since then, so this should still hold true for every subsequent SC600. The H2 runtimes on mk. IV Plus indirectly confirm that. Now the SC700 is a whole another beast with what I expect to be ~1/3 larger surface area and mass, both of which help with dissipation proportionately, so it could potentially stabilize at 8–9W, meaning you'd see as much as 1100–1200lm on H1/H2A sustained (at least in favorable conditions) until it runs out of juice, which is in about two hours for a 18.5 Wh battery. Considering one of my most common usage scenarios for the SC600 is a bike lamp, where sustained usage numbers are more important than the peak, this is definitely potentially good news for me. But do note that it's just ballpark estimates based on cross-referencing whatever information is available, not even napkin math level, so take all of it with a grain of salt.
I have also sent a few questions regarding the UI and the battery to the sales dept, will post here when they respond.
The SC52d is actually a Luxeon emitter.
...And the other one is a mule, whereas the problems only arise with reflectors. So naturally there should be no problems with either. 
