"I've heard a lot of people in my social / online circles comment how they wish they knew whether or not they had antibodies"What people need to realize is that the important questions are not whether you've got antibodies but:
1 - whether you'll sick when you're exposed to the virus again
2 - how sick you'll get the next time around
No one knows the answers to these questions yet, and we also don't know how antibodies bear on the answers to these questions.
It is possible that even with antibodies you'll still get sick if you're exposed to the virus (as we know is the case for some other diseases), and even if antibodies play some role in how sick you'll get it's possible that (again, as is the case with some diseases) repeated exposure to the virus will cause even greater illness than the first time around.
People shouldn't be assuming that having antibodies means they're immune.. we just don't know enough yet to say whether that's true or not.
Even if it is true, there might be a certain level of antibodies that are required to have a certain level of immunity, and we don't know yet what level of antibodies are necessary, nor the kind of antibodies necessary,
Finally, even if antibodies do grant immunity, we don't know how long that immunity would last, nor if such immunity varies from person to person for some not yet known reason.