There are several functions which have not been implemented. Most of the limitations are documented in the Release notes:
One person has documented a function that is similar to the tone() function.
I am not sure if the other functions have a work around yet.
So far there have been no updates to the IDE since the release of the Galileo, and there has been no communication as to when the next release will be.
There have been people coming up with work arounds though, so that is good.