I think it is still possible to buy the crossgrade code from HALion 6 to Absolute 5 now in the sale but hold off on activating it. If so, that is what I would do - buy now, then activate Absolute 5 once Steinberg have confirmed that the grace period for Absolute 6 has started.
That way, you should get HALion 7 (almost certainly the major instrument update in Absolute 6), Backbone, The Grand 3, plus all the content packs included in Absolute, also you can sell your standalone Groove Agent 5 licence. I have left Retrologue 2 and Padshop 2 out of the list of benefits of crossgrading - you already have licences for those instruments as part of Cubase Pro 12.