Comment 18 for bug 896339

Acknowledged means that the developers understand that there's an issue and that something should be done about the issue, but nobody's assigned to it and it's not certain yet who is going to work on the issue or when.

Long story short, you can set an issue to acknowledged even if you aren't certain about getting it done.

For now, it would be best to set this to acknowledged, since nobody has actually confirmed that this will be worked on.