I've only recently revisited the trust page, which looks pretty good.  IMO, if there is space to be reserved for US trust law, we ought to have space for other jurisdictions, since there are differences for each.  In addition, there may be some merit in developing a project to examine some different approaches to trusts.  The work that has been begun on Purpose Trusts is good, but Forced Heirship, reserved powers and so forth could merit articles.  Loads of work, I know.