But not really - lots of new stuff was added - structures, unions, pointers, function pointers, operator definitions, a heap - all stuff that hadn't appeared in a language spec before, things we all see and use every day.

The big problem was that the language spec was incomprehensible (I've done a language implementation), trying to embed syntax and semantics into the one spec - the maths guys went a bit overboard there. The other main problem was trying to solve the reserved word problem by defining effectively multiple fonts/type faces for different parts of the language .... at a time when even lower case wasn't really an option for most people