Suggestions for next models:

[The Chaz Storm]

Yeah, that's why I am thinking Diesel, Harvey, and some others have a strong chance of coming out next.

[Diesel #261]

Anyone think we will see Spencer anytime soon?

[ZeldaTheSwordsman]

ROTFLMFAO!How about accurate express coaches?The current models are all
wrong.
Look at these pics from the TV show:

NOTE:In seasons 1 & 2 the modeling crew frequently forgot to add the
undercarriages to the coaches when assembling them.

[metal4life]

Anyone think we will see Spencer anytime soon?

Err..Spencer has been out since Christmas 2006.

[Diesel #261]

Darn!   I never knew that.

[Myself]

Darn!   I never knew that.

Why be disappointed? Now you know he's out, so you can buy him now (or when you haave enough money set aside)! 

[Diesel #261]

Still dude I am so  now.

[The Chaz Storm]

Don't be, if you didn't know about it then don't beat yourself up over it.

BOT

[Duckfan8]

Here are my suggestions:

Engines

Donald & Douglas
Murdoch
Arthur
Molly
Rosie

Rolling stock

Vent Vans (From Season 1`s Flying Kipper)
Old Coaches
Bolster wagon

Sets

Edward oval set with Old Coaches
Henry oval set with red coaches

[ZeldaTheSwordsman]

I concur heartily.