Update March 2, 2018: Tom's Hardware has also done some digging into the chances of Nvidia launching new graphics cards at either the Game Developer Conference or GPU Technology Conference in March, and have come to the same conclusion as us - it ain't happening.
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Tom's have spoken to their own sources, we've spoken to Nvidia a number of times, and they've all been very definite. There are no new gaming GPUs being launched in March, sorry if you've been hoping otherwise, but that's just wishful thinking.
Nvidia haven't been vague about it, haven't skirted around the issue, they've told us directly that there won't be any gaming products launched this month. Damn.