Hi,
The new beta hopefully has fixed the color pick issue when using the brush tool, however now pressure sensitivity doesn't work anymore.
I know this is a beta and its supposed to have bugs, but the brush tool is one of the most essential features of such software, it should be top priority in your internal test processes :-)
Could you please submit a new beta 4 which has this fixed as soon as possible, as its almost 2 months now that we can't do any serious digital painting with AP on iPad!