What this actually means for our 'long liners' I don't know
For true 'long liners', it means nothing... you're stuffed anyway as you are already operating at the margins of what the technology supports. Infact the speed/distance drop off is
potentially steeper on ADSL 2+ than on standard. Its greatest benefit is for those sitting near the exchange who already get a decent ADSL service, it gets them faster speeds.
What happens to Unbundled services? Will the equipment (TalkTalk and Sky) be able to handle the new service or will it only be BT customers who 'benefit' from the upgrade?
LLU is LLU.
Operators just rent the last-mile copper from BT. What happens with the service is down to them because its their kit at the exchange. That's the whole point, and the whole benefit of LLU, is that you escape BT's ghastly oversubscribed network.
Chances are your LLU operator will support ADSL2+....its probably just a software update or config change on their kit.