For me the most important ones is this list: - new Slann model - new Salamander model - new Razordon model - some new Skink hero with a command ability to make up for the loss of the Chief.
I tried to track down the expected cycle of Lizardmen/seraphon releases once. We shouldn't see anything for the seraphon for a few years I think, but there is a picture in the PtG book that has some spear and shield dino-warrior statues that may be foreshadowing. Just for fun, my personal wishlist would look like... - plastic Dread Saurian - a Krog Gar model - Updated Saurus infantry (Warriors, Knights and Guard) with more dynamic pose options - plastic versions of the Finecast models that need the update (which would probs be all of them)
When it comes to GW the only thing I expect is to be disappointed. Sometimes they surprise me but usually I end up feeling justified in my expectations. If we see any new models or kits in the next two years it will be a nice surprise.
Honestly I just want Cold Ones on the level of Dark Elves and our Saurus Warriors/Guard/riders to look more like the updated Oldblood sculpt.