Hmm, quite sure it was the Raspberry Pi 3 with its quad core that ignited the SMP work in AROS, so not x86, but ARM. Anyways, the AROS developers have said quite explicitly that there will not be any SMP support for AROS/m68k. So, how this hyperthreading will be utilized by Amiga products is not easy to guess.
Also, the news is that Apollo Core will have hyperthreading, not that the core running on Vampires will have it - those are two separate products, remember? The Amiga vampire platform is merely guinea pigs for the real product, which is the Apollo core.
It doesn't matter what ignited it. But of late, the progress with AROS SMP has been with the x86_64 version which I test on a regular basis and it works quite well.
Clearly Gunnar's announcement implies that the Vampire will support hyper-threading since the Vampire uses the Apollo core and not some other core.
But all of this remains to be seen. At least there are some interesting things going on with regard to 68K development.