Question:
With the new Teensy LC coming out with 2 SPI buses. Will it be possible to parallel two SPI strips at full-speed?
http://www.pjrc.com/teensy/teensyLC.html
Not in parellel yet, no. I may add that in the near future however. I’m still working out how I want to do parallel SPI output (both bit-bang’d, and multiple SPI devices in parallel).
No worries, figured I’d ask. This is something I’d really like to use so if you ever need a tester I’m very willing 
Honestly, if you’re using something like the APA102 in a setup that lets you run at full speeds, halving the time to write a frame isn’t going to buy you a whole lot. In the meantime, you will still be able to hang two led strips off the pair of hardware SPI ports and use them both at full speed. (Note: this works today on the teensy 3.0 and 3.1)
If you’re driving a huge number of LEDs, more than about 500-800, where such speedup techniques might matter, you should really do yourself a favor and spend the extra $8 for the much faster Teensy 3.1 with far more memory.
In a big project with hundreds of dollars spent on LEDs and power supplies, even just the mundane construction supplies and wiring will usually cost more than either Teensy.
For a small project with under $150 in LEDs, Teensy-LC makes great sense.