>>> That's not exactly new; quoting from <http://www-cs-faculty.stanford.edu/~knuth/abcde.html>:
>>>
>>>> The latest and best TeX is currently version 3.1415926 (and plain.tex is version 3.141592653); METAFONT is currently version 2.718281 (and plain.mf is version 2.71). My last will and testament for TeX and METAFONT is that their version numbers ultimately become $\pi$ and $e$, respectively. At that point they will be completely error-free by definition.