only thing I will say regarding 30a ignition is if you check kitz forums there is discussions on the new firmware been rolled out and things like a 4th US channel have been added to the vdsl driver which indicates a future 30a rollout.
In regards to the line cards, personally I dont see it happening any time soon, is it business sense to replace existing cards only purchased recently, BT would be replacing cards in dslams still been rolled out and only rolled out in existing areas anytime within last 0-3 years. If they were planning it I would have expected them to be using V41's in the ECI cabinets.
BT Infinity 2 Since Dec 2012 -
BQM