Most KT133 boards offer the option to raise the FSB quite high, up to 133 or in some cases even 166 Mhz. However, th KT133 chipset does not actually work properly with a FSB of higher then about 110 Mhz - sometimes more, sometimes less - and never with 133 Mhz.
This limitation is due to the chipset and not because of the CPU! Tests with the new chipset, which supports a FSB of 133 Mhz show that most of the current CPUs made for a FSB of 100 Mhz work fine with a FSB of 133 Mhz. Of course by doing so, they're overclocked by 33%.
So, no, the current boards with the standard VIA KT133 chipset do not support the upcoming FSB133 CPUs and the option to raise the FSB to 133 Mhz is not really an option.