A few thoughts:
1) Looks better. The old site was 2000ish.
2) More or less the same as the old.
3) Harder to find saver Y, which is a good thing. Too many CC junkies with miles to burn. Better to obscure it and save some inventory through less redemptions. Also an easier prelude to dynamic pricing.
4) Less travel agent features for ticket building. I suspect this is a fair trade off, most people are buying a simple RT and will Be confused by too many options. Less likely to have bugs too. With more flyers being less experienced, and this trend likely to continue, seems a prudent move. Simplicity in this case is a better product overall.