From overnights.tv:-
8 February, 2013 11:45
BARB reported channels
Sky Sports Active channels that currently make up Sky Sports Active Other will become separately BARB reported channels starting 11th March, 2013.
◦Sky Sports Active Hi 1
◦Sky Sports Active Hi 2
◦Sky Sports Active Hi 3
◦Sky Sports Active Hi 4
◦Sky Sports Active Hi 5
◦Sky Sports Active Lo 9
After the 10th March, Sky Sports Active Other will cease to be a reported channel.
Sky Sports Active 1-8 channels will rebrand to Sky Sports Active Lo 1-8 starting 11th March, 2013.
◦Sky Sports Active 1 rebrands to Sky Sports Active Lo 1
◦Sky Sports Active 2 rebrands to Sky Sports Active Lo 2
◦Sky Sports Active 3 rebrands to Sky Sports Active Lo 3
◦Sky Sports Active 4 rebrands to Sky Sports Active Lo 4
◦Sky Sports Active 5 rebrands to Sky Sports Active Lo 5
◦Sky Sports Active 6 rebrands to Sky Sports Active Lo 6
◦Sky Sports Active 7 rebrands to Sky Sports Active Lo 7
◦Sky Sports Active 8 rebrands to Sky Sports Active Lo 8
source: Kantar Media
There are currently 5 HD labels at 11.469H - 1421 to 1425. The above suggests that they are to become HD red button sports services for Football First, Champions League etc etc. If it means NFL Redzone will be available in HD next season i'll be happy.