The debate about Naim's decision to release what they have just announced seems rather pointless, and in some cases levels criticism at Naim that seems quite unfounded. Whilst I haven't followed Naim's product evolution for more than a couple of years I cannot say for certain, but from my awareness of the ranges and recent evolution, it seems likely that there will often have been updates or replacements for products that have appealed more to some people and less to others, with a time spacing between releases in any particular category or range inevitably dependant upon the amount of R&D required, availability of resources and the company's judgement of what sector is either overdue or is likely to have good marketability.
i don't doubt that having just made a vast step forward with the Uniti range the next steps will be somewhere else - and undoubtedly already under internal development as all the R&D for the new Unity range will have completed long before they were ready to release them.
If I were to bother guessing I'd go for something in the streaming and/or DAC category above the Uniti range, for a range of reasons, e.g. it will be evident to Naim that they have been losing sales to competitors in this category in recent times, and computer power continues to develop rapidly meaning that what was the ultimate state of the art only 5 years ago is entry level now, so they can have a much more platform at their fingertips, as well as many more years of programming development. And aside from that, as others have pointed out the amplification range has only recently been DR'd, while I suspect that analogue amps have reached a maturity that they are unlikely to progress much further.