I saw that comment mentioning "BB4+", as well. I've done pretty extensive research on this and AFAIK there is no 4+. I think what poster meant was that they've done additional updates beyond 4, such as additional library updates beyond what are included in 4.
If there were an actual "4+" release, I I wish people would just upload these things to Aminet, instead of relying on hunting down obscure websites. *sigh*