Everyone is hung up on this "Pro" moniker. It's just a buzzword Apple used to separate one line of laptops from the lowly MacBook and the 11/13" Airs. Apple is under no obligation to continue this:
Adios White MacBook (already done)...
Adios all MBP's…
Adios both MacBook Airs…
Adios Optical Drives…(Add an External for $59)
Adios USB and Firewire (Get a multiport Thunderbolt Dongle for just $179.95

)
Hello revamped and redesigned 11/13/15/17 plain old MacBooks (which look a lot like beefed up Airs). Not sure if the 17" flavor will make the transistion though. Just like the Mac Pro… Apple may not know exactly what to do with this beast).