It's not really sandbox or romance-centric?
Nope! Our group will have the freedom to do other things (they certainly don't have to be a large group the entire time - that would be exhausting). But I'll have big events available for when we feel up to it. For example, we all write a boss battle to clear a floor. And then we break off into smaller groups to recover/explore/whathaveyou.
I have had one too many (or like 34324545 too many) romance-centric SAO roleplays. If it happens, it happens. And that would be cool, because I've only seen real RP chemistry like twice. But nah, it isn't a main focus!