Tab grouping and auto-tiling aren’t new by any means, but zooming to a subset of windows is very, very neat. It isn’t worth paying a subscription fee for (and if it proves to be really productive it might get Sherlocked within a couple of years, depending on whether Apple manages to shrug off the mess that is Stage Manager), and is likely to have three open-source clones tomorrow, so I’ll let the hype settle and give the concept a try once I find an implementation I can hack.