There will be Windows 7 (Vistas succesor). Itll be released after Sims3. Can I play Sims3 on Windows 7? -

Sims 3 would be released: February, 2009. Windows 7 would be released in June 2009 or AFTER June 2009.

Yes you will be able to. On another note, I say Windows 7 is Vista SP2 under disguise, since Vista has gotten such a bad rep their just changing the name xD