This is SageTeX 3.0. Well, perhaps it should be a release candidate or beta or something, as I already have improvements that really should go in.
The most significant change is a backwards-incompatible change to `sageexample` and `sagecommandline`: before, you could use `...` (three dots) for continuation lines, but now you must use `....:` (four dots, colon) which matches what the Sage interpreter actually does.