Most likely the biggest info of the MSI reveal event. "Is B450 ended?" was one question. Eric responded "No... infact B450 will continue to atleast 2021".
Additional info from MSI's livestream I just skimmed through.
The MPG B550 Gaming Carbon Wifi is their flagship B550 offering: 6 x IR359 Doubler with 12 stage TDA21462 each handling 60 Amps
https://i.imgur.com/sFYwQOB.jpg
Michiel stated that 12 Stage will be the max B550 will have on MSI's offerings.
2oz copper will be featured on the purple icon boards on a 6 layer PCB, apparently this will lead to a 20c reduction and dissipate heat faster:
https://i.imgur.com/KNcal84.jpg
The B550 release will see MSI's B450 range drop in price. B550 will cost more than B450 did at launch. ITX model board has 2.1 HDMI but everything else is 1.4
B550 Tomahwak looks very similar to the X570 Tomahawk:
https://i.imgur.com/1Je4Wfd.jpg
Segmentation was shown. No MEG boards on B550:
https://i.imgur.com/yuZPits.jpg
Funny info. There won't be any white motherboards because signal integrity is too bad. Only black motherboards can handle PCIe4.
Tomaahwak has 4 RGB headers:
https://i.imgur.com/yTpLHfV.png
All boards will feature a flash BIOS button:
https://i.imgur.com/VQX2F39.jpg
All boards appear to be daisy chained wit DDR4 speeds supported upto 4,866 Mhz. Might be marketing speak but they claimed the best DDR4 support on B550. They have 2-3 full time RAM module testers:
https://i.imgur.com/KsRgIh9.jpg
However most models will be limited to 4,200 Mhz
All models will have a Type-C front panel connector.
The flasgship Gaming Carbon Wifi will be $219. In euros it's 249 but that includes VAT.
MPG Gamign Edge Wifi 10 Phase is $189. 209 euros.
B550 Tomahawk specs outlined (ALC1200 Audio):
https://i.imgur.com/12BC7NI.png
It will be $179 and 199 euros with VAT.