As a Regular member of NBA, the cost for the Interim Manual is $32. If you're getting the price of $48 off of the website store, it's because the member price will only show if a member is logged in and looking at the item. Additionally, the member discount on items are posted at the end of the transaction when checking out.
Also note, the Ask an Expert log in and password are different and independent of the store. If you are having trouble logging in to the store, or require assistance with logging in, feel free to contact the office directly and I'd be happy to help.
I realize that may not answer your question about a newer version coming out, and I will let a forum admin field that question. As always, thanks for your support!