I think there will be no support for Buildcraft Pipe reasons for this:
Sorting Machine is omnidirectional input/output simultaneously on every Side work very fast but use EU For only simple Sorting you can use a DiamontPipe( no energy cost)..
Pah, Buildcraft requires an API for very simple things such as inserting into Pipes, it is pointless to make/keep an API for things for which ISidedInventory is more than enough for inserting into any Pipes. No new Interfaces needed and in case of Redpower also no Transposer needed for insertion.