Not as far as I have heard. I doubt that ebay wants to sort it out, as it would mean Simple postage could not cope, with only one tracking number for several items, and of course ebay might get less in fees.
I have seen several cases where sellers have sent more than one item in a package but unable to mark as dispatched or prove delivery for more than one item.
Before ebay introduce their new systems, they should sort out the bugs first, not just ignore them.