Mmmm I am indeed hoping for an upgrade to Gungnir sometime. Bifrost had the Uber upgrade. So I hope it'll be Gungnir's time soon.
Likely not a problem to get it now if the DAC fits your needs/budget. The upgrade will likely be something you could order later to add/install (like with the Uber for Bifrost). There is good reason they tout Bifrost and Gungnir as upgradeable and "futureproof" DACs.