SDS might just manage to get some stocks of their VR outside sill GY wagons and the balance of modern JCW's to the show.
On-Track don't have a stall listed so I guess no painted Sprinter samples to see.
Southern Rail will have the 2nd Run Vlocity samples on display. Perhaps their latest QR diesel samples too. I have a feeling they might even sneak in a new unannounced VR wagon release as newsletters have hinted there are a few surprises coming this year.
Orient Express will no doubt have samples of their Glenelg Centenary Cars.
Auscision can always be relied upon to have a discount box on the stall. Their new book release might be available, or at least a sample to flick through.