'Informed speculation' is that NASA may reveal evidence for episodic flows of briny (but liquid) water.
Some of the nutters are suggesting the announcement would be of the discovery of life, but that's almost certainly not the case. The radiation environment on Mars' surface is extremely hostile.
And other tin-foil hatters are certain that NASA will reveal the presence of alien bases....
I think if either of the latter were the case, we wouldn't be waiting for a press conference - the President of the US would have been on live TV to make such a monumental announcement!
Time will tell.
Dean
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