HF1 and HF2 are included in SP1 - they would not need to be installed prior to SP1 unless it is specified (which it is not). The Known Issues that still exist with SP1 are still present in 4.0 OEM or HF1 and HF1 patches. The Unknown Issues (which are not listed because they are not known) will be something new to SP1 that may or may not be included with OEM, HF1 or HF2, as it always is with any patch update.
In the beginning the Universe was created. This has made a lot of people very angry and is widely regarded as a bad move.