• She is collaborating together with me on a cover for a magazine • At the present time, we don't know the title of the magazine

Which sentence best restates this information?

She and I are collaborating together on a magazine cover, but at the present
time, we don't know the title of the magazine.

She is working together with me on a magazine cover, though we don't
know its title as yet.

She and I are collaborating on a magazine cover, though we don't know the
magazine's title yet.

Though she and I don't know the title of the magazine at the moment, we're collaborating together on its cover.