I hate to break up the party but I don't envision Roland producing an ARX Piano card in my humble opinion. We already have around 80 Ac. Pianos on the Fantom G right now. :O Here's my take... Roland
could possibly make a USB stick with SuperNATURAL Ac. Pianos on it just like they did for the RD-700 GX digital piano.

It would be cheaper and less R&D costs for Roland for one thing and it would leave more time for them to concentrate on other projects. Roland is probably concentrating in other areas like a VA or B3 Organ card and also a Strings/Orchestra/Choir, as well as an ARX Guitar card maybe too. Although, an ARX Guitar card may be off the ticket because Roland is really pushing NI's Guitar Rig VST software. In fact, I purchased Guitar Rig Pro 4 a while back because Roland hounded me to do so and I buckled.

But an ARX Ac. Guitar Card might still be an option though. I do think a B3, Strings/Orchestra/Choir and/or VA ARX card would be fantastic and HUGE hit(s) in my opinion. And if an ARX module ever comes out with at least "four" slots it would be icing on the cake and even more incentive for Roland to create more and more ARX cards in the future. We shall see... but Frankfurt Musikmesse 2010 could be the start of something BIG.

Here's to hoping.
Me... (SuperNATURAL USB stick) Jazz, Contemporary Christian, Gospel, Rock/Pop