Are there any testers testing on AMD
Yes.
I very much doubt it which is a great cause for concern
Do not be concerned.
At the moment, the 32 bit USB drivers are being TESTED, to be sure that the concept works. It does. When the drivers are actually RELEASED, then it becomes your concern to test them, to be sure that they work for you (if they don't, you can report the problem, and AN will try to fix it). At that time, it is also up to Arca Noae to release the source (or not), which will NOT include the DDK, You will still need the DDK to be able to use the source. Since that has always been the case, there should be no concern (the concern would be that somebody illegally releases the DDK, and gets the whole project into trouble with IBM and the law). If someone cares to recreate the DDK, LEGALLY, I am sure that very few people would be able to make use of it anyway.
I will admit that I have an interest because I will not have an Intel processor in any of my equipment even notebooks and the lack of testing does show up.
What do you mean by that statement? I have preferred AMD, for many years now, and haven't seen any problems because of it. I do have machines that are Intel (donated to me by windows users who felt compelled to buy a new machine), but they certainly don't work any better, or worse, than AMD. You MAY run into troubles if the machine is UEFI without a functional Compatibility Support Module (CSM), or if they don't have a DVD drive, or USB 2.x capability (USB 3.x support is getting closer, and part of that was to convert the drivers to 32 bit).
For your information, I am TESTING with:
Asus A88XM-A motherboard (AMD, A6, UEFI), with 8 GB memory.
Asus M3A78-EM motherboard (AMD), with 5 GB memory.
Lenovo ThinkPad T510 (Intel), with 8 GB memory.
Lenovo ThinkPad L530 (Intel UEFI), with 8 GB memory.
IBM ThinkPad T43 (Intel), with 1.5 GB memory.
IBM ThinkPad A22e (Intel), with 256 MB memory.
DELL Dimension 4300 (Intel), with 1 GB memory.
DELL Optiplex GX-270 (Intel), with 3 GB memory.
Asus P4VP-MX motherboard (Intel), with 1 GB memory.
HP p6242f (Intel) with 8 GB memory, and a NVIDIA video adapter (NOT recommended).
Overall, the DELL and HP, machines have problems with video, when I try to use a wide screen. The IBM ThinkPad A22e is, of course, almost useless because the memory is maxed out at 256 MB, but it does work well, as long as I stay with programs that will run without having to page. The DELL 4300 has a problem with Air Boot, so I need to use Boot Manager with it (it is NOT an Air Boot problem).
FTR: The P4VP-MX has a PCI SATA adapter, with a 2 TB SATA drive attached and a 1 Gbit NIC. I use it as an OS/2 (ArcaOS) based NAS box.