There is so much more to DACs than just a chipset (like the analog section, implementation, etc..); there are more differences to the TT that cannot be implemented in a portable unit due to power implications and form factor. Moon Audio did a great job summing up some of these differences:
http://blog.moon-audio.com/chord-hugo-versus-hugo-tt-differences-explained/
I've heard DACs based on the ESS Sabre chip from $1000 to $5000 and the latter was a good step up from the "other things" in the DAC beyond the chipset.
So for portability, it does look like the Hugo 2 will be a killer unit, but for those who are using it in a desktop application and need things like galvanic isolation, balanced outputs to feed into a balanced amplifier, supercapacitors, improved power supply, etc..., the TT looks to fill the void until you look to make the leap to the DAVE.
I am looking forward to reviewing the Hugo 2 and the Poly for the Mojo!