
One thing to note in these videos are the use of 5420 SoC and not the first Exynos 5 Octa 5410. This could mean HMP may not come to the Exynos 5 Octa that powers Galaxy S4. This is just a speculation but highly plausible at the moment.
https://www.youtube.com/watch?v=fLrSTJECVaU
https://www.youtube.com/watch?v=8LNPxExkLMo
https://www.youtube.com/watch?v=1t-6jqhELVk