Samsung's new Pro-Audio SDK (zero/low latency audio & MIDI) and a DAW called Soundcamp for Android
Supports third party plugins too and looks like Thumbjam will be one of the first to be ported from iOS.
"The Pro-Audio SDK 2.0 provides low-latency audio and MIDI functionality to Samsung Android devices, and it also has zero-latency Audio/MIDI connections between independent music apps.
Soundcamp is a Samsung is a developed mobile DAW app that harnesses the full power of the Pro-Audio SDK and can be integrated with multiple 3rd party music apps for up to 8 tracks."
"Professional Audio provides the following features:
Musical Instrument Creation
API for creating professional instrument applications
Support for all functions of the JACK Audio Connection Kit
Plug-ins for acoustic piano, steel guitar and a standard drum kit
Support for USB Audio devices
Support for Audio input
Usage of the real-time scheduler
It can make a connection between apps at the SDK level
It is easier to move to other apps and support its remote control"