I just got an e-mail from Hue this morning announcing a new Hue-compatible product, the Click for Philips Hue: Philips Hue Page – RunLessWire
This is a "Friends of Hue" product that can be paired to your Hue network and configured via the mobile Hue app like, I assume, the first-party Tap and Dimmer. I suspect it could also be paired to a ZHA network like Hubitat and used similarly to the Hue Dimmer, but I'm unlikely to buy one just to find out. It costs $60 USD, over over twice as much as the similar Hue Dimmer with what I see as only a few advantages: I assume each side can control different lights/rooms if you want, and it fits in a standard decorator plate (the Hue Dimmer is a bit too large). It also looks a bit more like a standard, albeit bifurcated, decorator switch, though the Dimmer is close and probably equally intuitive.
Plus, I'm on Hubitat and I already have something I can fit into a standard decorator plate and make control Hue lights or whatever I want for a fraction of the price: Pico remotes. (Though if I'm only using them for Hue lights, I confess being paired to the Hue network makes Hue devices like the Dimmer and presumably also this device a bit snappier...)