I'm thinking 40106, Bachmanns' members day is at the ELR in September, and 2 class 40's are hot off the press already.
Though given we've had 20172, an 08, a wcrc 37, 2x Pullmans, sealink coaches, an MLV, exhibition coaches were a bit overdue an offering for steam modellers... Especially as all bar 1 of that list have yet to sell out... Vs the near perfect steam sell out (only the patriot so far left available).
D335 could be an outsider 2nd guess from me.
For steam, 13065, of course we could always be surprised by a bluebird.. A class would be nice.