I expected the Wii to do well, and to be in the lead at this point in the life cycle, but not by this margin. I figured the PS3 and 360 would fight tooth and nail against each other, and that Microsoft had learned some valuable lessons going up against the PS2, and were better equipped to compete this time around.
I figured the Wii could sneak in and surprise both of them, pulling ahead slightly in overall sales, something like a 45-41-38 type sales breakdown, likely in the order Wii-PS3-360.
Of course E3 came, and PS3 was $600, and that's kind of when I figured all bets were off.
Third parties avoided Nintendo for the two previous generations, I didn't expect it to change right away, but I figured once they saw the market swing towards Nintendo, and coupled with the smaller development budgets, things would change. Guess we've seen how well that played out.
DS I never saw coming. I thought it looked like a neat idea, but I couldn't really see how it would be implemented. I figured the media playback ability of the PSP would help spur momentum more than it ever did.