For now, the only options for connecting Helix Stadium to the PowerCab 112 PLUS and 212 PLUS is the 1/4" or the XLR cable connections.
The L6 Link connection is not available yet because the Expand D10 box has not been released.
All the features that are included with the L6 Link connection, this would need to go along with the Expand D10 additional hardware. (Release date TBD)
The 1/4" or XLR connections doesn't have any additional 'controller' features. When future updates are released, they'll have the ability to connect with D10 Expand and then L6 Link to the PowerCab.
This only applies to PowerCab 112 PLUS and 212 PLUS that includes the L6 Link connection.
The Expand D10 is currently only available for pre-order at various retailers.
Check our product page for more info, and future announcements: