This draft Kickstarter campaign for a Bluetooth ZX Spectrum could be interesting. My old 48K only has a partially function keyboard (I really should get around to getting a new keyboard membrane for it), and Elite's emulation on iOS is generally pretty good so this could be a good way to get a more authentic Speccy experience. I certainly hope that it will be useable as a standard Bluetooth keyboard so other emulators (e.g. Spectaculator) can support it.
Update The Kickstarter is now live.