No, no one could. A will has NO effect until you pass away--it is not enforceable until then, can be changed or revoked whenever you want, does not give anyone any rights to anything before you die, etc. Not having any effect--being essentially a purely hypothetical or theoretical thing--no one would have "standing," or a legal right, to force you to reveal it. To have standing, you must suffer from damage, loss, restriction, etc.--i.e. an "injury" of some kind; but there can be no injury from something that has no effect or power.