Attempt upgrading on a test forum first and you won't have any issues with modifications breaking your website. The whole purpose of the testing enviroment is to catch errors and fix them before attempting the
real upgrade.
As for converting from hacks to offical products; There is no doubt in my mind that someone out there will want to do this and will have the know how to write a custom importing routine for the data. We can only hope that they release it here for everyone else. We'll just have to wait and see how popular these new products become...the more people using them the better chance someone will modify 'em.
Have a good one! O and hey Wayne! How are things on the left coast?