Level A is already out. Level B is due in the fall, as mentioned. Now – this piece of advice is based on edition 1 – but you could probably start your Level B student out in Level A, going faster, then skip a few lessons when you get Level B…. if you needed to start right away…
Personally, I’d like to use the manipulatives more, and it is great that the new edition does that.
The other thing – and I don’t know if this has been improved or not – is that there are a few places in the 1st edition that tend to be walls – as in the student is doing fine and then suddenly is struggling. There aren’t many – but it looks like there is a bit of a leap. This is about lesson 68 in Level B, and one again around lesson 90 in Level C…. These are common spots that you hear about on the RS yahoo group. I imagine that this has been noted and fixed…
I’d like to do the Edition 2, but I have children in Level C and B (and one too young for anything…) so it isn’t an option.