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By then, maybe the version number will encode the program itself. :-)

probably not as only donald knuth is allowed to modify it

He documented this plan already in 1990:

> At the time of my death, it is my intention that the then-current versions of TeX and METAFONT be forever left unchanged, except that the final version numbers to be reported in the “banner” lines of the programs should become

> TeX, Version $\pi$

> and

> METAFONT, Version $e$

> respectively. From that moment on, all “bugs” will be permanent “features.”

(See http://www.ntg.nl/maps/05/34.pdf)

For those who are not aware, it's a sad day because changing the version to pi and freezing it is Knuth's will when he dies.