That will be huge if superconducting could be accomplished without liquid nitrogen.

How flexible is the stuff room temperature superconductor would be tremendously useful outside of computers but only if it is flexible enough to be handled like aluminum wire.

This is incredible... tin's about 3 times the cost of copper, but you'd only need a fraction of it. This could revolutionize motors, batteries and power transmission. No resistance = no heat or line losses. Color me skeptical of anything that claims "100% efficiency", but if it is, I suppose it is.
Maybe it's time to start dusting off those patents that required room temperature superconductors. An "electric jet" may not be such a crazy idea after all.

Slowburn: "How flexible is the stuff room temperature superconductor would be tremendously useful outside of computers but only if it is flexible enough to be handled like aluminum wire."
Some currently marketed superconductors which need cooling are made flexible by layering them on a conductive--but not superconductive--tape so flexibility may not be too big an issue. Capacity may be though.
I notice that they are not using the term "superconductor", possibly to be conservative in their announcement. It is certainly an interesting development if it is verified experimentally and may have uses even if it doesn't make it as a true superconductor (however that is defined). But they will need to learn to produce it cheaply, which could take some time, and what arrangement is best to maximize the effect.

You seem to assume that there will be no current limit. If I understand correctly, there is current limit at which current superconductors stop being superconductors. I see no reason why this wouldn't be a case here. Probably that is the reason why uses in chips are mentioned, not uses in power transmision.

The article states that this substance only conducts electricity on its surface, but as it is only one atom thick, the surface is also the entire thickness of it. Atoms are three-dimensional, however small they are. Layers of the stuff could be stacked together, and would therefore appear to pass current through the entire thickness. Superconducting electric motors, here we come!

A sheet 1 atom thick probably has very little current capacity, hence the suggested applications in the article. I think layering sheets, which would presumably have to be seperated somehow, would be an even greater manufacturing challenge.

Cant imagine the type of smartphone you can have...

how about a spiral "tube" to increase current capacity? would such a spiral have to have an insulator between layers? tensile strength of the stanene? decades ago a prof. at WSU did research on melting basalt rock and drawing through a hole for insulation purposes, but it also turned out to have 7 times tensile strength of steel...not very flexible though. maybe good for suspension bridge cables? but for power transmission it could work.

I'm not sure that superconductors have any practical current limit - I recall seeing a superconducting coil thinner than a hair that could carry over 10,000 amps at Rutherford Appleton labs, and that was 30 years ago. Mind you, the uncooled, room-temperature end of the connections were bigger than me!
For internal on-chip wiring, no flexibility is required. You don't need high current either, but no resistance also means no heat generation, which could remove a massive obstacle to increasing CPU speeds. Off-chip connections have far less to gain by this since you can just use fat wires as space isn't an issue: your computer's speed is not limited in any practical way by the current carrying capacity of its internal cabling.
As far as manufacturing goes, they should probably be talking to the graphene people who have been trying to deal with the manufacturing side for some time.
Room-temperature superconductors have been around for decades too - the big breakthrough was really having them work well with liquid nitrogen, since that's dirt cheap compared to liquid helium. I've heard it said that cooling the whole energy grid with liquid nitrogen would have paid for itself in reducing heat loss many times over by now.