yes the nforce4's should b out and easy to find in 1-3 weeks.
they have many more features than the nforce 3 boards (depending on the company u choose and $), but they will prolly rape the nforce 3. also keep in mind that the nforce4's have pci-express, so u may have to change ur vid card option.
p.s. if u r gunna buy sooner than the nforce4's DO NOT get a s754!!!! they are not the way to go because they will not be upgradable beyond 3400+ (correct if im wrong).
Homer: (crying) ahhh i dont remember the last time i cried like this!
Lisa: When u put ur shirt on backwards
Homer: (crying) o ya, (crying) the tag chafed my skin (crying)