You haven't heard because the media isn't focusing on it. Tokens spent by Ferrari/Merc/Renault last year.... all of them. Come the end of 2016, tokens spent by Ferrari, Merc, Renault and Honda... all of them.
The focus is on Honda because the media has it that way, nothing more or less. They have tokens, they use them, they have the same number of tokens. honda can't and won't make more changes than the other teams. Ferrari increased the size of their turbo and compressor, moved the location of the compressor and made many other changes. Did that stop that Ferrari running well in 2015 testing? Merc brough variable intake valves, a fairly big step in terms of layout of the top of the engine, they increased the size of their compressor last year. They've supposedly increased the size of the compressor again this year.
Of course everyone's going to use their tokens, hence the token process in the first place...
The Ferrari re-design last year was well documented, as was their acquisition of Mercedes PU staff.
And news just emerges that Honda are using different spec engines for testing before deciding on their race engine, still think their testing priorities are the same as Ferrari and Mercedes?