My understanding was that they are NOT opaque, and that if that has changed, it will invalidate much at least some wiki page, for examples at least some of the following would now be false:There was some confusion on IRC as to whether bitcoin addresses are opaque or not.For the sake of argument let's say that opaque means that you can tell nothing about the address by examining the characters.
https://en.bitcoin.it/wiki/Address
I also here that there is a LIKELY change from the base58 encoding ... when was this established?