My reseller doesn't seem to have much selection on the Gen9 models yet so I'll have to see what they're like in a few months.
I did read the quickspecs though and it tells you in there that the Bxxx cards are just SATA. Admittedly it's not exactly obvious if you're skim reading.
The performance models all have the P440 and that's what I'm waiting on availability, for those pre-configured models, but yes, it's a good warning to others that if you want or need SAS, make sure you know what you're ordering.
In my mind it was like the old E200 controllers and their limited functionality (but even those could do SAS), compared to the P400 model. It's too bad they didn't do something like that where it does SAS but just doesn't have the same features or included cache memory/battery/supercap etc.