2D games are possible. Someone tried to remake JJ2 in UE4 as purely 2D game. I don't have a link now, but it's somewhere on the JCF (it's abandoned though, I think).

Also I'd have nothing against JJ3D with Sonic Utopia-styled gameplay (obviously with gun).
https://www.youtube.com/watch?v=XBZgk8gJc6g

But again, I don't think it's new JJ, would be happy if it was, but I don't want to be disappointed if it isn't. For now I think it's just a case of "my new game is failing, our company's funds are near 0, but my old buddy is a CEO of a company I've worked at 20 years ago, so he will give me a job with job security attached."

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