Dreaming of a cable-less drivetrain but AXS' $2,000 USD entry price a bit much for you? If you don't mind taking a gamble on the unknown and possibly unproven, Wheel Top's wireless derailleur and shifter might be worth having a look at. I hadn't heard of Wheel Top, either, but the Google does bring up a handful of their relatively inexpensive components on AliExpress, an online retail seller based in China. So not exactly SRAM or Shimano, then, but let's be honest here: They had me at wireless.
Details on the parts are thin, and no one in the Wheel Top booth seemed too keen to talk about the stuff, but I was told that they're planning to offer both 11 and 12-speed versions.
This is actually a third-generation prototype, I was told, and while the quality (and target price) is clearly lower than what we're used to seeing from better-known brands, the prototype that I tinkered with was fully functioningish. The shifter moved the derailleur when you went through the gears, but there was an awkward and inconsistent delay between clicking the paddle and getting some action at the derailleur.
There was no chain or cassette, either, so who knows how it'll perform when pedaling loads are a factor, but it seemed too sluggish for primetime.
The lithium-ion battery clips onto the back of the derailleur. Sure looks familiar, eh?
The wireless shifter sports a dual-action paddle.
The battery is a lithium-ion block that clips onto the back of the derailleur, kinda like how AXS does it. No word on battery life, though. The shifter uses a dual-sided paddle that's either pushed or pulled depending on which way you want to go, and it has a built-in angle adjustment as well. It's likely powered by a CR2032 battery.
How much? Wheel Top thinks that the set will cost just a few hundred dollars when they start production this coming May, but you'll probably only be able to find it on AliExpress. So, who's going to take a gamble on this one?