There’s a thread about the TSS 
In particular it will be two separate boxes, digital and analog with an optical connection so that, for example you can put the digital box next to your digital sources and the analog box near your analog outputs without tying their grounds together or sharing an outlet, etc.
There will be Jensen output audio transformers of the kind that were used in the old analog mixing boards rather than the much less costly ones in the DS, etc.
There will be twice as many digital switches which will lower analog noise floor by at least 3dB. The switches themselves will be better than those in the DS (but the Mk II will be using them) and that will save another 3-6dB of noise floor.
Each of the four analog output power supplies (left/right and +5/-5) will have it’s own transformer windings and be otherwise isolated from the others. A separate transformer will be used for digital things in the analog box. Those dew digital things won’t include any kind of processor, etc. which would generate noise.
There will be three (or four depending on how you count) reclockers in series to further lower jitter. Each with its own quality regulator.
There will be a much more powerful FPGA (or two, or three) which will allow much more refinement of the digital algorithms.
Every input and output will have optional galvanic isolation (controllable ground lifts). The analog outputs will have more configurations like using the RCA output balanced, having the center tap of the transformer grounded to the output connectors ground or not… These will allow better integration with more varied systems than the DS.
More levels of regulation everywhere.
…
With a much less constrained budget there will be upgrades everywhere in the circuitry. (Well, I can’t do better than the current VCXO, but otherwise everything is upgraded.)
Here’s the thread:
TSS Two Chassis Super DAC - Audio Components / DACs - PS Audio