There have long been working Spectre attacks. From skimming the paper a bit, I think the contribution of this work is that they have come up with an attack that

There have long been working Spectre attacks. From skimming the paper a bit, I think the contribution of this work is that they have come up with an attack that works on Apple's processors, as well as bypasses for a number of mitigations WebKit has (that fall short of site isolation).