You could be right on the boards 48-51 issue. However, I never expected that OtO would see print before AoO, or that it still wouldnt be in print. Personally I love board 49. It has a lot of application possibilities, and is fun to play on.
On another note, I am starting to dislike board 48. I probably had used it because it was "or would be" new, but have pretty much left that out of consideration for the future.
On OtO. Yep, definitely not for the meek of heart, but there is a lot of action going on. I really liked Another Bloody Morning on the historical map.
Nothing like quad 20s, 88s, FT tanks, Mineroller tanks, OBA, stukas, Sturmovicks, etc all lighting up the battlefield at the same time

If this sounds interesting, OtO is definitely for you.
Chas