Yes yes yes! This is super exciting news.
If being an engine that takes us to Mars wasn't enough, it's also an engine that's being designed around reusability and high efficiency. It's a FFSC engine or Full flow staged combustion. It turns out that only 3 FFSC engines have ever been test fired, including raptor, and none have ever been flown. I'm not sure if you guys want details, but basically both all of the fuel and oxidizer run through their own preburner to spin the turbine for their respective pumps(hence full flow). Normally, a bit of oxidizer and fuel is siphoned off to the pre-burner(burns a bit of the mix to create power to spin turbopumps for fuel and oxidizer) while the majority flows straight to the combustion chamber. This difference allows the turbopumps to run at lower RPMS and cooler temps apparently due to the increased mass flow but I'm not sure on the the why of that.
hey are also methalox which burns cleanly(almost or as clean as hydrolox, unsure) and I'm pretty sure it's one of the few methalox engines ever to be test fired as well. Methalox is great for many reasons. Methane is more dense than hydrogen while not being quite as efficient in the combustion process. The trade-off is that you can store more of it easier. Hydrogen is a bitch to contain and we haven't really solved the problem of containing it for months on a spacecraft...Like hydrogen, methane won't leave any soot in the engines and burns with a greater specific impulse than RP-1(kerosene) which will become a necessity in the age of truly reusable rockets.
Basically, these engines are fuckin' rad. They're not just engines that will take us to Mars. They are the engines designed and built for the future using tech that hasn't been flown before. These engines are pushing multiple boundaries at once. I'm really excited for tomorrow.