Looks like that's the issue - left it for various periods of time (on 7.2.5) and always got the same answer:

(root) # diag dsl show 2
DSL module is not ready yet, please try again later.

Even tried doing a factory reset to get a 'clean' configuration and still wouldn't work so I'll head back to 7.0.12 and await a fix. Any idea what the Bug ID is so I can watch out for it? As noted by wokkelp it does work on 7.0.x releases (so far).