It will almost certainly be a class up, if only because it uses integrated tips that combine heating element, temperature sensor, and tip itself into a single element, rather than having thermally bulky and inefficient interfaces like the FX888d's replaceable separate tips. So you get faster heating and more accurate temperature control.

But there's the rub: there are a TON of USB-C irons that use integrated tips, and most are cheaper than this new iFixit iron, so you can get that class improvement for the same price as your Hakko station, so I'm curious if their improvements are a big enough step up from _those_ irons to justify the price.