So my list of items will very much be the same as everyone else's but here goes;

ho scale

Stepney (with moving eyes)
Tar tanker
Brown CCT utility van (they have the tooling and I personally would think it a great addition as it appeared numerous times in the classic series)

Narrow Guage

Brake vans (brown, blue)
Sir Handel

N Guage

James
Thomas, annie and clarabel starter set

I'm not too sure as to what i'd put for Large scale as i've never cared for it as such, so i'd rather people who do like it ask for what they'd want.

Honestly I would say that Stepney would be my most anticipated engine for them to release.  He's a popular character, cost effective to make, and i'm sure he would sell out in a heartbeat.

While Ryan is one of my favourite CGI era characters, there's no doubt that it should be Stepney who should be announced for the 75th anniversary year.  He's such a popular and iconic character and it would be stupid for bachmann not to consider making him.  Furthermore, I think it would help to raise awareness for his real life counterpart, who at the present moment is having problems regarding his future as a running steam locomotive.