I honestly do not see the problem with the dredclaw...It just a stormraven with no guns, and lower armour, and less transport capacity and fewer special rules...Nearly all SM can have ravens now.
Its not like we want a to deepstrike a landraider into your deployment zone (that would be silly).
Chaos are the one assault based army with no way of getting into assault (barring the rubbish chaos 'raider), the claw should have been in the codex. It would make units like mutilators and possessed a useful choice.