I also found that it took a few days for my cover image to appear on the B&N product page. In my experience with Amazon, it takes a few days for the product description to appear after the product page has gone up, so I'd call that a tie.
BTW, I imagine this has been mentioned elsewhere, but I found this online ebook converter to be the easiest way to convert my Kindle .mobi's to nook epub's:
http://ebook.online-convert.com/convert-to-epub
Calibre is so oriented toward managing libraries that I find it cumbersome for things like converting single (or a few) books.