Ok, so what's new in version 1.5 ?
Above all, the tape support is greatly improved, now supporting tzx turbo, custom loaders and flash-loading.
It's still not 100% (e.g. some speedlocks don't load), but getting there. Then there's multitouch support - not very functional on Nexus/Desires because of their hardware limitations, but quite useful on Galaxy S for example - you can finally use the on-screen fire button there, that's a new feature too.
You can also map joystick to hardware keys now - joystick fire is auto-mapped to the camera button on Sony X10, where you have virtually no other options. Some little bugfixes of course, and the brand-new WorldOfSpectrum search function. That's about it.