Which version number will this update feature? V46? Or just whatever version number comes out from incrementing older components?
That's undecided. Currently, most components are at V45, some at V46, and many we do not upgrade remain at V40. Make this "probably V46" but I do not know. It is really a formality.
Will it feature a less broken cdfilesystem (like cachecdfs in 3.9) and will it have UDF support this time?
No. It will likely have no CD file system because what was delivered before was just not usable, there is no manpower to fix (or rather rewrite) it, and there are plenty alternatives in Aminet, so you don't miss anything. We don't help anyone by offering a sub-standard system component if better alternatives are existing.
Do you plan on including atapiismajik (idefix97 kind of clone), from OS4 Classic, to deal with 4 channel IDE interfaces?
I need to check what the scsi.device I currently have actually supports. I'm not sure, but it *may* support such things. Anyhow, scsi (aka ide) will get fixes, but not a feature update. Again, this is a bugfix release, not a "please add my favourite feature" release. We don't have the manpower nor the time for it. Leave alone the beta testers to test it properly.
And please, dont waste your time updating for large drive support for the also ancient HDBackup + BRU twin brothers.
No chance, no time. HDToolbox, yes. Backup and BRU go right where they belong: SYS:Trashcan. There are really plenty alternatives with less ancient formats that are more up to date. Really, if you want a backup these days, get a USB adapter and an external harddrive or a thumbstick, and use SortCopy off aminet to make a 1:1 incremental copy of your data. BRU sources are rotten (yes, I really mean it), the program stinks. You don't get tape drives at consumer friendly prices, and you don't get new floppies, so the whole concept of BRU is just broken.