Buffett the flipper ?

Buffett's stake in PetroChina is coming under scrutiny from activists over the latter's Sudan connection. But anyone else notice that the recent update to Buffett's portfolio involves what looks like dumping of some holdings after only a short period. Whatever happened to buy and hold forever ? Or does that hold only for a selective few core holdings ?

Updates to Fidelity and Gates Foundation holdings also seemed to involve some short term flipping.

I am wondering if the continued market rise over the last few months has forced some into a different mindset than before. Either that, or long term must have been redefined!

What will Bill Miller's portfolio update look like ?