Tech Powerup - MSI Unveils Series of New X570S Motherboards
 
“With AMD launching the latest Ryzen 5000 Series processors, MSI X570S motherboards will also hit the market in the coming days. The new series of MSI X570S motherboards have not only upgraded specifications but also included brand-new designs. MSI offers a comprehensive upgrade for the power phase. MEG X570S motherboards have direct 16+2 phases with 90 A SPS and MPG X570S motherboards have at least 12+2 Duet Rail Power System with 75 A SPS. Both the MAG X570S TORPEDO MAX and the MAG X570S TOMAHAWK MAX WIFI have Mirrored Power Arrangement 12+2 phases with 60 A SPS as well.
 
A major change is to remove fans on the chipsets, which helps reduce dust and noise. In order to dissipate heat effectively without fans, the area of the heatsink that covers the chipset is enlarged considerably. Also, all MSI X570S Series motherboards feature at least 1 M.2 Shield Frozr which prevents throttling by offering the best thermal protection to help maintain SSD maximum performance. For hard-core users, we have the MEG X570S ACE MAX with 4 Gen 4 M.2 slots covered with M.2 Shield Frozr and Double Side M.2 Thermal.
 
The special edition MPG X570S CARBON EK X, has a 6 layered server-grade PCB with 2 oz thickened copper. The monoblock for the CPU and VRM sections is also purposely designed to incorporate carbon fiber elements. The MPG X570S CARBON EK X allows significant performance and uninterrupted gameplay without noise. The newly integrated flow indicator provides instant loop operation and coolant flow overview. The MPG X570S CARBON EK X has a 14+2 Duet Rail Power System with 75 A SPS and 4 Gen 4 M.2 slots with all-covered M.2 Shield Frozr. Equipped with onboard 2.5 Gbps LAN and Wi-Fi 6E, the MPG X570S CARBON EK X owns a front USB 3.2 Gen 2 Type-C.
For more information, visit this page”
 
 
At the present time there is no pricing for these motherboards.  None the less, they are decent looking boards.

I would make a wild guess that the "S" adds at least $75 to the regular X570.  As far as why so late, unknown and I wouldn't speculate.

Airwolf24
the MEG X570S ACE MAX also looks good too, also I can't wait when evga Unveils their two x570S motherboards :D 

I am also waiting on EVGA to release their motherboards. Knowing that KingPin is behind the stress testing of the motherboards makes it more appealing.