Going by the latest Victron Q3 pricelist (just published, strangely for Zaire only so far) there's a new Multiplus II 48/15000/200-100 available from October, but still no bigger Quattro II on the horizon -- only the 48/5000/70-50/50 which has been out for some time now...
Means I'll probably have to stick with the original Quattro 48/10000 for my boat build and put up with the higher idle power consumption (60W vs. 38W) and temperature derating -- but then it's easier to fit in and could well be quieter going by MP II comments, so not all bad :-)