Only when something that is price sensitive is sure and certain...

Only when something that is price sensitive is sure and certain is there an obligation to disclose. Disclosing stuff that is not sure and certain can be ultimately misleading so pretty much a no go area.

Continuous Disclosure: an Abridged Guide1.

IntroductionThis Guide is published to assist listed entities and their officers to understand and comply with their disclosure obligations under Listing Rules 3.1 and 3.1A.

These rules provide:

3.1 Once an entity is or becomes aware of any information concerning it that a reasonable person would expect to have a material effect on the price or value of the entity’s securities, the entity must immediately tell ASX that information.

3.1A Listing rule 3.1 does not apply to particular information while each of the following requirements is satisfied in relation to the information:

3.1A.1  One or more of the following 5 situations applies:

  It would be a breach of a law to disclose the information;

  The information concerns an incomplete proposal or negotiation;

  The information comprises matters of supposition or is insufficiently definite to warrant disclosure;

  The information is generated for the internal management purposes of the entity; or

  The information is a trade secret; and

3.1A.2  The information is confidential and ASX has not formed the view that the information has ceased to be confidential; and

3.1A.3  A reasonable person would not expect the information to be disclosed.