So basiclly what you want to say is that you don't have any clue when you'll fix your features.

I remember ePassporte... they started like you...
"we'll fix it by the end of the week"
"sorry, but we weren't able to fix it now, we'll fix it by next week"
"thing are out of our hand, we don't know when it will be fixed, but we are working on it"
"sorry guys, we'll just run with your money"