" You can add "needs", but it changes the meaning (a little). The original means that we're still waiting for it to be completely confirmed, waiting for someone to confirm it. It doesn't bring in the idea of need, even though we can deduce from the context that the writer probably thinks it needs to be confirmed.
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janewantslearnI feel it should be "It is still in a working stage and still (needs) to be completely confirmed..."You can add "needs", but it changes the meaning (a little).