I come here to say but one thing: Please, please, please for the love of all things just and, unjust in this universe, do not create yet another power system for us to manage. Thermal Expansion is a fantastic mod, it adapts well to Buildcraft energy and, with the array of converters available at our disposal opting to run TE machines via EU or UE is a breeze. It is however, a major headache for anyone in the business of configuring config files for balance see: every budding mod pack creator, with just three power distribution models to worry about. Tacking on yet another system will force another power converter, more balancing between each network revolving around, "This much TE energy equals a certain amount of MJ, which must also equal out to a set amount of EU and.." I'm sure you can see where I'm going with this.
As for the questions about new pipes and, pipe logic. Gates/wires/caps, they're all fantastic additions to Buildcraft that when utilized properly allow for some truly intriguing setups. Still, they are far from perfect. Pneumatic tubes filled a niche for me, they offered a low cost method of routing items that appealed to me when initially starting out in a world. A viable low cost alternative would be much appreciated.