Hi Calvin,
A big indicator, I would think, is that in the last couple of generations of Turntables, B&O moved the phono pre-amp out into the Turntable itself (not unlike moving the power amp into the speaker, really), where I'm sure they thought it belonged. Having already taken that step, it would seem pretty backward-looking to try to re-incorporate one into the BeoSound family now...and besides, there isn't an available input given that modern BeoSounds only have one input.
On the other hand, external phono pre-amps are dirt cheap, really, so why not find one that precisely matches your needs, and go from there?
We kid because we love.
Bang & Olufsen Tysons Galleria
McLean, VA USA