Im thinking of getting two core sets and splitting with my friend. I feel there's a lot of value in the core sets and the additional listbuilding options will be exciting.
The only thing to double up on that you cant really make use of without mirror matches is having 2 of the same hero, but even then a spare heroic base and a model to go nuts with converting is pretty nice.
I guess it also depends on what else is releasing immediately. If the extra units and command packs are releasing with Wave 0 it may be 'one of everything' instead of two cores. Will be waiting on those announcement articles...