WOW! That looks freaking cool. A 5 foot indirect Octa! I don't know if it's going to have an internal diffuser based on the indirect design, so you'd likely either be using it like a big silver para reflector or with the diffuser as a smaller more directional version of the El Octa.
It's not going to be cheap though! Every other indirect modifier that Elinchrom sells is right around $1k, so I would be surprised if this was any less expensive.
Another thought... both Photoflex and Chimera sell 5' Octa Fabric grids that might fit this! 



