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Like I said, maybe, maybe not. I do tend to trust Ian Cutress (he posted this after CES, I.e. later than the articles you linked)."An MSI representative has shared some interesting information about Intel's pending 11th Generation Rocket Lake-S processors over at the Danawa forums... The statement also seemingly confirms that current 400-series motherboards, including the H410, B460, and Z490 chipsets would support Rocket Lake-S." (link)
"The Z490 chipset will be the first to get a BIOS/firmware update to offer full compatibility, with H410 and B460 boards to follow suit." (link)
So MSI guy says all 400 chipsets will be Rocket Lake compatible (which certainly fits in with the fact that B365 being a 22nm "Kaby Lake Refresh chipset" (instead of 14nm of other Coffee Lake chipsets) didn't prevent it from having identical compatibility with the full range of 8th & 9th Gen CPU's. It would be nice to hear official confirmation on this as "Z490 will be updated first" and "only Z490 will be updated" are two completely different things and it's possible someone at AT got confused.
There‘s also a way that both statements are true, but that depends if the i3 which are supposedly not RKL but instead Comet Lake refresh are / were considered 11th gen, or not. This way, 410 and 460 boards will support 11th gen but not RKL.
We will see soon enough and I do keep my fingers crossed that they are fully RKL compatible.