Probably new, but a bad idea. It does not really offer anything new (same old pieces), and wrecks the standard game in several ways. Having an extra super-piece instead of a minor greatly upsets the trading opportunities, which makes standard chess such a well-balanced and interesting game: it is important to have about twice as many pieces in each next-lower value class (1 Queen, 2 Rooks, 4 minors). Secondly, Bishops are color bound, and having only one of them on a different square shade than the opponent excludes the many interesting end-games with like Bishops. It would probably be slightly better to use an inversion-symmetric start position (Kings on e1 and d8). Then you would throw away the unlike Bishops end-games, which at least would reduce drawishness somewhat.
Note that I am not one of these people that reject any variation on the rules of Chess as a matter of principle, but this just seems a step backward for no reason.
Of course having a spare Bishop in the set instead of a spare Queen would make it logical to allow only promotion to Bishop! This is an interesting idea in itself.
Maybe this already exists, my apologies if so. I honestly don't have the time to go through dozens of chess alternates pages to see if I invented this or not.
Anyway, here is my idea:
Most modern chess sets come with 2 queens. Why not use them?
Set up the board in the traditional way, except put 2 queens where the bishops normally go. Place a single bishop where the queen normally goes.
Everything else about the setup and game is the same.
Thoughts?