On the Community Forum on the Innuos website, Stephen Healy from Innuos states the following:
STREAM1 replaces ZENmini and PULSEmini
STREAM1 + LPS1 replaces ZEN Mk3 and PULSE
STREAM3 replaces ZENith Mk3 and PULSAR
This appears to be the overall structure of the Innuos line (below the higher end Statement and Nazare products). However, there is considerable flexibility in how the new products can be configured, depending on output modules and power supplies.
When I replaced my Zen Mk3 with the Pulsar, I heard immediate improvements in bass extension and impact, as well as in high-frequency transparency and openness. I was already using a PhoenixUSB unit with my Zen, so I simply kept the PhoenixUSB rather than adding a Phoenix "Lite" module to the Pulsar. I haven't heard either the Stream1 or Stream3 in my own system, so I don't have any direct experience in hearing differences in sound quality with respect to the new models.

