VIA bought them out. Then, before the buyout was complete, they had Nat Semi "lay off" most of the M3 (Jalapeno) team. Then they bought Centaur from IDT. Then they made the Cyrix III (which was codenamed Caynenne at one point, then jedi, then gobi, then Joshua). Then, WHILE KEEPING THE CYRIX III NAME, they switched the cores to what was a revised winchip 4 design by the Centaur team.
Cyrix as a company is LONG, dead. (and, in some peoples opinions, deservingly....though they'll always have a place in my heart as they inspired me to learn what I know....but they'll also have a place in my computer, as mines OLD 😛 )
There are some hopes that the M3 design is still going on, but from now on, the designs are coming from the centaur design team. Cyrix is dead.