While there are still some bugs to work out, I like the new site. I hated how with the old one you couldn't just put in a month and see all cruises available - you had to search by location. Also it only showed pricing for the cheapest category available (usually an inside) , you had to click into it to see pricing for verandas, concierge, etc.
With the new site, I can finally choose which month I want to sail and have all the options come up - showing pricing for the lowest inside, ocean view, verandah, and concierge available all at once.
Haven't been able to access my current reservation on the new site though, so it is still buggy.