Well, I stand corrected. Axe fx it is then. Thanks everyone for the links.
I did notice that hetfield's tone was tighter in the lows in the recent rock am ring concert and didn't have that low mid bloat it used to have, for example in the 2009 Mexico City shows. The bass overall seems much more controlled. I am glad this setup will allow them to play more shows due to lowered shipping costs, per Chad's (Hetfield's tech) post. I never though that shipping these tube amps was so significant a cost, compared to say, shipping lighting rigs, stage props, taking private planes, staff salaries and transporation, etc. I must admit that I did not hear any "digitalness" in the sound and would have been/was fooled into thinking these were tube amps.
that said, i little part of me died with these news. end of an era... Glad I was at the last show where they used tube amps, The Apollo theater in NYC.