Multi-touch for android is working, you can run the tests, and play with TouchTest, try to control the white blocks with multi-touch.
But it has a critical bug #422, we will fix it in the next version.
Thanks for the report of overlapped sprites flickering, I just run SpriteTest of tests on my HuaWei u8800 cellphone, android 2.2 device, and it renders well with any flicker.
Can you tell me your environment? android device? version? cocos2d-x version? An unit test code to reproduce this bug will be appreciated!