I think the LB may be nearer the 702 than 722 - but we will have to wait and see. Of course, it may be different in the USA as SD is made in the USA and the Nagra in Europe, so the exchange rate may get in the way.
Which comes with TC capability?
You can buy a 702 with time code. It's the 702T. The only other 7xx with time code are the 744T and 788T. No time code for the 722.
While the Nagra VI is impressive I can't see the LB making a huge dent in the market for sub $2500 recorders. SD has such a huge lead in the marketplace already and the LB does not appear to offer any gotta have features that the 7xx boxes don't.
I like the Nagra VI but it looks rather dated when compared to the similar priced Zaxcom boxes. The Aaton Cantar x2 is a bad ass box but is $5k or more than the Nagra or Zaxcom boxes.