I have had about a week to play with this new Beta version now and I can find nothing to recommend it apart from the 1st letter of the group name being displayed. Everything else is a step backwards, mostly cosmetic, but one item is a HUGE problem.
As part of these changes they have changed to relationship predictor to exclude everything further out than 4th cousin, so for example the very last match in my list at 1 segment of 8cM according to Ancestry has a 68.9% chance of being in the 4th cousin group (4C,3C1R etc). This is an utterly ridiculous number, SegcM (my go to predictor) has the 4C group at 1.7% and the highest likelyhood being 8C1R at 20.9% which feels a lot more like it to me.
This in itself wouldn't have been a problem as Ancestry's predictions have always been poor and I have never trusted them but they have compounded this by enforcing them. This means that I cannot set any relationship outside of what Ancestry allow so for my smallest match at 8cm I cannot now set "Distant Cousin" and put the true relationship in the notes, as I have been doing, but have to leave it as their suggested "4th cousin or half 3rd cousin 1x removed".
This leads to the farcical position in ThruLines of being unable to set the relationships Ancestry itself suggests.
As you might imagine I have let Ancestry know my feelings on this. I would urge anybody who has the Beta version to check this out and confirm what I have found and if so let Ancestry know.