Currently developers familiar with how to using Android's command line tooling can run Titanium-built APKs against Android new x86 emulator, so long as those APKs were built to run against the Rhino runtime. If the apps are built to run against the V8 runtime, they fail with the following errors from logcat indicating issues with missing stlport libraries. If necessary I can recreate these logs, but they should occur anytime you run a Titanium-built android app using V8 on the Android x86 emulator.
The way I understand it is that V8 is compiled with the Android NDK. All code compiled with the Android NDK is architecture-specific, and to this point it has only been built for ARM architectures. I'm sure I'm oversimplifying, but a build of V8 against the x86 architecture would likely make it possible for V8-driven Titanium Android apps to be run on the Android x86 emulator.