@Kit - we don't recommend you configure it to use host headers. As the article says, we recommend you use two IP addresses and two web sites. Your solution would not be supported at the current time.
@Markus - it's impossible to say what a future roll-up may or may not do, though they should not break this if we do our bit right, though as with all roll-ups and service packs, it's always very good practise to test it yourself first in a test lab before deploying to production, just in case you have something unusual configured. So try and keep a virtual lab copy of what you have in production, so you can quickly and easily test (and rollback if needed) any updates you want to apply.