There are no BT study notes for the new Ang chapters yet. As you imagine, the questions David comes up with do take some considerable time to write down.
Anyway, these new GARP readings are highly valuable as you may have noticed that topics around factor-investing are discussed nearly every day in the major financial newspapers.
If I have time in the next couple of weeks I will come up with an extra post (summary) about factor investing to make the Ang chapters a bit more clear.
In case you are interested in the original soft-copy of Ang's book, please do give me shout.