There used to be decent chapter summaries on trade.gov, but it looks like they've been nuked like everything else in the transition.
The Australian government has decent chapter summaries too though, I'd encourage reading those:
http://dfat.gov.au/trade/agreements/tpp/summaries/Pages/summ...
Chapters you may be interested in:
Investment (the controversial ISDS provisions are in this chapter)
Intellectual Property
Labour
Environment