Know-How Exchange : Branding

Presumably, since it's a "temporary closing" you share the plans going forward. People want to know where you're going, and understand mistakes happen.

This is less to do with branding and more to do with PR. Tell people you're re thinking your approach in order to best meet people's needs.

Stockholders take risk...they know the ups and downs of new markets (or should)
Simply tell them the researc used was faulted (as above) "temporary closing' to restructure

On new products, moving launch dates are not uncommon. As such, it generally isn't the end of the world.

If you have a next stage date that is set, you can go ahead and announce that (keep in mind, you don't want to announce until you are sure the date is set - but you also need to announce early enough that you can promote the date). If you haven't listed a date nor specifics for the next event, just "going quiet" about next stage is generally fine. Not optimal to do this, of course, but the damage to your brand would be minimal.

If you did put put specific dates that you now won't be meeting, then you will have to announce cancellations. A bit more damaging that just going silent, but still generally not a killer.