Yeah, wait and see what trickles through from AMD to board manufacturers.

In the mean time see what comes for patching the OS in the form of updates.

If ASRock's stance is that Spectre does not require a hardware level fix (BIOS/UEFI microcode), they are flying against what seems to be the wiser voices on the 'net.

Meltdown is a non-issue for Ryzen so it seems.  This has been declared from so many sources that I can feel fairly safe in saying that is true.

Spectre has more than one variant and they behave differently, and therefore require different approaches to protecting against them.

Spectre takes advantage of the branched predicted processing that happens in these complex CPUs.
It is claimed that to defeat Spectre, not only will OS patches be required, and possibly all software need recompiling with a new compiler, but updates to the way the hardware works is also going to be required.  Some voices call for complete hardware redesign, but we have what we have.

I've taken all of the Windows 1703 updates and the InSpectre.exe tool still claims I am at risk of Sepctre.  It maybe semi-patched in 1709 Fall Creators, which I am holding off for a little while longer.

AMD's statement:

http://www.amd.com/en/corporate/speculative-execution
AMD claim to be providing microcode updates to customers (motherboard manufacturers) shortly.

As yet, I cannot find Sprectre related updates on other motherboard manufacturer's sites either.  I guess it's a wait and see.

If you want/need more info on what is planned for Spectre you need to contact AMD. If AMD do release any kind of fix/update then ASRock will undoubtedly release the appropriate updates for effected boards.