This. Sata Express/M.2 looks promising; there are no mobo's with multiple M.2 ports so far though, so sorry, your 2 GB/s is still not enough for me - a raid0 md

This. Sata Express/M.2 looks promising; there are no mobo's with multiple M.2 ports so far though, so sorry, your 2 GB/s is still not enough for me - a raid0 mdadm device with 4+ very good Sata3 SSD can beat it. OTOH if a mobo with 2 (or more) M.2 ports hits the market, things are probably going to change...