The reports are that the top box is color coordinated with the bike, and it's 47 Liters storage volume. Expected since it IS designed for this bike. Other than that no news on availability or other details. There is a thread on the board that shows photos of the accessories but no other info is known, that I know of anyway.
My dealer says he hasn't seen any info on the availability of accessories yet, at least not here in the US. Which means my wife is going to have to hold on tight for awhile until a backrest comes available. Which means she'd better behave until then lest my throttle hand get a little too restless.
Well now I have the bike I am delighted I did not try to get accessories sooner. My dealer now has photos but no pricing yet. I found the standard windscreen just fine and my helmet fits inside one of the side bags so I guess I just want the centre stand particularly after finding the LS pnm-2.5 Park n Move from Legal Speeding
I think that the accessories on the other thread are all from Japan. Glad to hear that @ballward found most of the stuff he was looking for though. It shouldn't be too hard to find a center stand that will work with the CTX 1300. Do you have any leads on ones you might buy?
I am sure the Honda stand made for the CTX1300 will be out before 3rd party stands that will fit are available... unless you take very careful measurements between the mounting tabs and get lucky to find one the right length.