The book is old, from IBM's heyday but most of the principles have remained unchanged.
One thing you'll find different is that they recommended offices for everyone so that each person could work in a quiet environment where they could focus as opposed to today's open area. I'd argue the open area has it's merits but everyone wears headphones so the current trend may not be all that great. Promoting a team that communicates is the goal, having an open space is merely one way to try and implement that.