There are quite a few cx bikes getting spec'd di2. Jamis has a aluminum disc di2 bike for $3900. They also told me today that all their cx bikes will be disc. It will be interesting to see how di2 does for cross. On paper, it should be awesome. Slightly heavier, but not having to worry about cables getting ruined after 1 muddy bike race sounds encouraging. Plus the shifting is way better, super strong consistent shifting. I only fear the worse to happen if a small pebble or stick gets stuck in your drivetrain during a mudbath. All of a sudden that $3k bike now costs another $500 to replace that derailleur.